Desde la torre del castillo, el valle se ve más bonito.

Desde means from here, and it marks the viewpoint or place you are looking from.

So:

• Desde la torre del castillo = From the castle tower

Spanish often puts this kind of location phrase at the beginning when it wants to highlight the perspective.

You could also say:

• El valle se ve más bonito desde la torre del castillo.

That version is also correct, but it puts the main focus first on the valley rather than on the place you’re viewing it from.

Because de + el contracts to del in Spanish.

So:

• de el castillo → del castillo

This contraction is required in normal Spanish.

Compare:

• la puerta del castillo = the castle’s door / the door of the castle
• el patio del hotel = the hotel courtyard

The only common time you do not contract de + el is when El is actually part of a proper name, for example:

• de El Escorial

It means the tower of the castle or more naturally in English, the castle tower.

The structure is:

• la torre = the tower
• del castillo = of the castle

So Spanish uses a noun + de + noun structure where English often prefers a compound noun:

• la puerta del coche = the car door
• la capital del país = the country’s capital

The comma separates the introductory phrase Desde la torre del castillo from the main clause:

• Desde la torre del castillo, / el valle se ve más bonito.

This is similar to English when you start with a phrase like:

• From the castle tower, the valley looks prettier.

In Spanish, this comma is very natural and helps readability, especially when the opening phrase is a bit long.

Because verse is a very common way to say to look, to appear, or to be seen.

So:

• El valle se ve más bonito = The valley looks prettier / The valley appears prettier

If you used ve without se, the verb would usually mean sees:

• Juan ve el valle = Juan sees the valley

So se ve here does not mean sees itself. It is an idiomatic way to describe how something appears.

Not really, at least not in the usual learner sense of doing something to itself.

This is not:

• The valley sees itself

Instead, se ve is part of a very common Spanish pattern used to talk about appearance:

• se ve bien = it looks good
• se ve mal = it looks bad
• se ve bonito = it looks pretty

So for learners, the most useful thing is to treat verse here as a set expression meaning to look / to appear.

Because bonito refers specifically to beauty / prettiness, while mejor means better in a broader sense.

So:

• más bonito = prettier / more beautiful
• mejor = better

Compare:

• El valle se ve más bonito = The valley looks prettier
• El valle se ve mejor = The valley looks better

The second sentence is possible, but it is less specific. It could mean better in general, not necessarily more beautiful.

Because bonito agrees with el valle, which is masculine singular.

• el valle → masculine singular
• therefore → bonito

If the noun were feminine, the adjective would change:

• la ciudad se ve más bonita = the city looks prettier

So the adjective must agree with the noun it describes.

Because here bonito is describing how the valley looks, so it functions as a predicate adjective after the verb.

This is normal after verbs like:

• ser
• estar
• parecer
• verse

Examples:

• El valle es bonito.
• El valle parece bonito.
• El valle se ve bonito.

If you put bonito before the noun, that would be a different structure:

• el bonito valle

That sounds much more literary or marked, and it is not what this sentence is doing.

It compares the valley to some other point of view or situation, even if that comparison is not stated explicitly.

So the sentence implies something like:

• it looks prettier from the castle tower than from somewhere else
• or it looks prettier from there than you might expect

Spanish, like English, often leaves the second part of the comparison unstated when it is obvious from context.

If you wanted to make it explicit, you could say:

• Desde la torre del castillo, el valle se ve más bonito que desde el pueblo.
• From the castle tower, the valley looks prettier than from the village.

Yes, you could say:

• Desde la torre del castillo, el valle parece más bonito.

But there is a slight nuance:

• se ve más bonito = focuses on how it looks visually
• parece más bonito = focuses more on how it seems

In this context, se ve más bonito sounds especially natural because the sentence is about the visual view from a particular place.

Because Spanish normally uses the definite article with specific countable nouns in cases like this.

Here we are talking about a particular valley:

• el valle = the valley

Spanish generally uses articles more often than English in some contexts, but here both languages use the article naturally.

You also see it in:

• la torre
• el castillo
• el valle

All three are specific things.

Yes. A very common alternative is:

• El valle se ve más bonito desde la torre del castillo.

Both versions are correct.

The difference is mainly one of emphasis:

• Desde la torre del castillo, el valle se ve más bonito.
  Emphasises the viewpoint first.

• El valle se ve más bonito desde la torre del castillo.
  Emphasises the valley first and sounds a bit more neutral.

Yes, bonito is very natural in Spain Spanish. It is common, everyday, and idiomatic.

Other possibilities are:

• bello = more literary or elevated
• hermoso = also more expressive or literary
• precioso = very positive, often stronger than bonito

So:

• más bonito sounds simple and natural
• más bello sounds more formal or poetic
• más hermoso sounds more emotional or literary

For ordinary speech, bonito works very well.