Haec imago antiqua a multis pulcherrima appellatur, et forma coronae adhuc clara est.

Because haec agrees with imago, which is feminine singular nominative.

• hic = masculine singular nominative
• haec = feminine singular nominative
• hoc = neuter singular nominative/accusative

So haec imago means this image with both words in the same case, number, and gender.

Yes. Imago is a feminine third-declension noun.

That is very common in Latin: grammatical gender does not always match the nominative ending. A learner used to first-declension -a feminines may expect all feminine nouns to look like that, but third-declension nouns often do not.

So here:

• imago = feminine
• therefore haec, antiqua, and pulcherrima are all feminine too

Antiqua is an adjective modifying imago.

It is:

• nominative
• feminine
• singular

because it agrees with imago.

So haec imago antiqua is simply this ancient image. The fact that antiqua comes after the noun is normal Latin word order for an adjective.

Appellatur is:

• 3rd person singular
• present tense
• passive voice
• indicative mood

from appellare.

So grammatically it means is called or is named.

The ending -tur is a very common sign of a 3rd singular passive verb in Latin.

Because appellatur is passive, and a/ab + ablative is the normal way to express the personal agent of a passive verb.

So:

• a multis = by many people

Here multis is ablative plural, and a marks the people doing the calling.

A useful contrast:

• passive + person doing the action → usually a/ab + ablative
• passive + thing/instrument → often simple ablative without a/ab

So a multis is exactly what you would expect with a passive verb and human agents.

Formally, multis is an adjective, but here it is being used substantively—that is, as if it were a noun.

So a multis means:

• literally: by many
• naturally in English: by many people

Latin does this all the time. An adjective can stand on its own when the missing noun is obvious.

It is nominative because it agrees with the subject imago.

With verbs like to call, to name, to consider, Latin often uses a complement describing what someone or something is called. In the passive, that complement matches the subject.

Compare:

• active: multi hanc imaginem pulcherrimam appellant
  • many people call this image most beautiful
• passive: haec imago ... pulcherrima appellatur
  • this image ... is called most beautiful

So pulcherrima is nominative feminine singular because it goes with imago.

Pulcherrima is the feminine nominative singular superlative of pulcher.

The pattern is:

• pulcher = beautiful
• pulchrior = more beautiful
• pulcherrimus / pulcherrima / pulcherrimum = most beautiful

Many adjectives ending in -er form the superlative with -errimus rather than the more usual -issimus.

So:

• masculine: pulcherrimus
• feminine: pulcherrima
• neuter: pulcherrimum

Because it depends on forma.

Forma coronae means the shape/form of a crown. That is a very normal use of the genitive in Latin: one noun defining another.

So here:

• forma = shape, form
• coronae = of a crown

This is often called a possessive or more generally a dependent genitive.

Adhuc means something like still, even now, or up to this point.

It tells you that the statement remains true in the present. So it modifies the idea expressed by clara est.

Latin adverbs often have flexible placement, so adhuc does not have to stand in exactly the same place that still would in English.

Because it agrees with forma.

In forma coronae adhuc clara est, the subject is forma, and clara is a predicate adjective with est. Predicate adjectives agree with the subject in:

• gender
• number
• case

So:

• forma = feminine singular nominative
• clara = feminine singular nominative

That is why it is clara est.

Yes: the word order is quite natural for Latin, but Latin is much freer than English because endings show the grammatical relationships.

For example, in the first clause:

• Haec imago antiqua introduces the subject
• a multis gives the agent
• pulcherrima gives the description used in calling
• appellatur comes at the end, which is very common in Latin

In the second clause:

• forma coronae is the subject phrase
• adhuc modifies the statement
• clara est finishes the clause

So the order helps with emphasis and style, but the endings are what really tell you how the words fit together.

They are joined by et, which simply means and.

So the sentence contains two coordinated clauses:

1. Haec imago antiqua a multis pulcherrima appellatur
2. et forma coronae adhuc clara est

The second clause adds another statement about the same general subject.