Landskapsbildet viser fjellet.

Because Norwegian usually writes compound nouns as one word.

Here, landskapsbildet is built from:

• landskap = landscape
• bilde = picture/image
• bildet = the picture

So:

• landskapsbilde = landscape picture
• landskapsbildet = the landscape picture

This is very normal in Norwegian. Where English often uses several words, Norwegian often combines them into a single compound noun.

The -s- is a linking sound/letter used in many Norwegian compounds.

• landskap
  • bilde
• becomes landskapsbilde

It does not mean possession here in the same way English 's does. It is just part of how the compound is formed. Not every compound uses a linking -s-, but many do, and this is something learners usually get used to over time.

Because -et marks the definite form of a neuter noun.

• et bilde = a picture
• bildet = the picture

In Norwegian, the definite article is usually attached to the end of the noun instead of being a separate word like English the.

So inside the compound:

• landskapsbilde = a landscape picture
• landskapsbildet = the landscape picture

For the same reason: fjellet is the definite form.

• et fjell = a mountain
• fjellet = the mountain

So the sentence uses two definite nouns:

• landskapsbildet = the landscape picture
• fjellet = the mountain

This is completely normal Norwegian grammar.

Because Norwegian usually puts the at the end of the noun as a suffix.

Examples:

• en bil = a car

• bilen = the car

• et hus = a house
• huset = the house

So in your sentence:

• landskapsbildet already means the landscape picture
• fjellet already means the mountain

There is no need for a separate word like English the.

Viser is the present tense of å vise.

• å vise = to show
• viser = shows / is showing

In Norwegian, the present tense is the same for all subjects:

• jeg viser = I show
• du viser = you show
• han/hun viser = he/she shows
• vi viser = we show

So viser does not change depending on the subject the way English sometimes does.

Because this is a normal Norwegian main clause with the basic order:

subject + verb + object

• Landskapsbildet = subject
• viser = verb
• fjellet = object

So literally, the structure is:

The landscape picture shows the mountain.

This is the most straightforward word order in Norwegian.

Yes, but the meaning changes.

• Landskapsbildet viser fjellet = the landscape picture shows the mountain
• Landskapsbildet viser et fjell = the landscape picture shows a mountain

So the difference is definiteness:

• fjellet = the mountain
• et fjell = a mountain

No. They are different verbs.

• å vise = to show
• å se = to see

So:

• Landskapsbildet viser fjellet = The landscape picture shows the mountain.
• Jeg ser fjellet = I see the mountain.

English speakers sometimes confuse these because both can involve looking or visual content, but in Norwegian they are clearly different verbs.

Both bilde and fjell are usually neuter nouns.

That is why they use et in the indefinite form and -et in the definite form:

• et bilde → bildet
• et fjell → fjellet

The whole compound landskapsbilde also takes the gender of its final part, bilde, so it is neuter too:

• et landskapsbilde
• landskapsbildet

It would be:

Et landskapsbilde viser et fjell.

That means:

• et landskapsbilde = a landscape picture
• et fjell = a mountain

Compare the two:

• Et landskapsbilde viser et fjell. = A landscape picture shows a mountain.
• Landskapsbildet viser fjellet. = The landscape picture shows the mountain.

A useful way to split it is:

landskap + s + bilde + t

More naturally:

• landskap = landscape
• s = linking element
• bilde = picture
• -et = definite ending

So the core noun is bilde, and the rest modifies it.

That means the whole word is literally something like:

landscape-picture-the

This kind of structure is very common in Norwegian and other Germanic languages.

The ll is just part of the noun fjell.

• base form: fjell
• definite form: fjellet

You keep the noun and add the definite ending -et.

English speakers often notice that fj can be unfamiliar. The word fjell is often one of the early words learners meet because of Norwegian geography. The important grammar point here is simply:

• fjell = mountain
• fjellet = the mountain

So the spelling change is not irregular; it is just the normal noun plus its ending.