קשה לי להבחין בין שני הצבעים האלה, אבל היא התרשמה מיד מהתמונה.

Hebrew often does not use a dummy subject like English it in expressions such as it is hard, it is important, or it is possible.

So:

• קשה לי = literally hard for me / hard to me
• natural English: It is hard for me

Hebrew simply starts with the adjective and does not need an equivalent of English it here.

לי is ל־ + אני, meaning to me / for me.

In this kind of sentence, Hebrew uses ל־ to mark the person experiencing the difficulty:

• קשה לי = it is hard for me
• קשה לך = it is hard for you
• קשה להם = it is hard for them

So לי does not mean me as a direct object. It means for me or to me.

After expressions like קשה לי, Hebrew usually uses an infinitive to say what is hard:

• קשה לי להבין = It is hard for me to understand
• קשה לי לזכור = It is hard for me to remember
• קשה לי להבחין = It is hard for me to distinguish / notice the difference

The ל־ at the beginning of להבחין is the normal marker of the infinitive, similar to English to.

Here להבחין means to distinguish, to tell apart, or to notice the difference between.

In this sentence, להבחין בין... is a very natural choice for distinguishing between things, especially colors, sounds, details, and similar items.

A learner may also know להבדיל, which can sometimes overlap in meaning, but להבחין בין שני הצבעים האלה sounds very natural for to distinguish between these two colors.

Because Hebrew uses special forms of the numbers 2 before nouns.

With a masculine plural noun, you use שני.
With a feminine plural noun, you use שתי.

Since צבע is masculine, colors is צבעים, so:

• שני צבעים = two colors

Not שתיים צבעים.

So בין שני הצבעים האלה is grammatically correct.

Because when Hebrew says these two colors, the noun is normally definite:

• הצבעים האלה = these colors

So when you add שני, you get:

• שני הצבעים האלה = these two colors

This is the normal Hebrew way to say these two + noun.

In Hebrew, demonstratives like this / that / these / those usually come after the noun:

• הצבע הזה = this color
• הצבעים האלה = these colors
• התמונה הזאת = this picture

So:

• שני הצבעים האלה = these two colors

This is very different from English word order, where these comes before the noun.

Because the sentence does not list the two colors separately. It treats them as one unit:

• בין שני הצבעים האלה = between these two colors

If you were naming two specific items, Hebrew often uses patterns like:

• בין X ל־Y
• sometimes בין X ובין Y

But here there is no need, because these two colors is already one complete noun phrase.

התרשמה is the past tense, third person feminine singular form of the verb להתרשם.

So it means:

• she was impressed
• she became impressed
• sometimes more literally, she formed an impression

The subject is feminine singular, which matches היא.

This verb belongs to the התפעל pattern, but you do not need to translate that pattern directly every time. In this sentence, the important point is simply that התרשמה = she was impressed.

Good question. In Hebrew, the verb form התרשמה already tells you the subject is she.

So היא is not strictly necessary. Hebrew could also say:

• אבל התרשמה מיד מהתמונה

But adding היא can make the contrast clearer, especially after אבל:

• I had trouble distinguishing the colors, but she was immediately impressed by the picture.

So here היא adds emphasis or contrast.

Because the verb להתרשם usually takes the preposition מ־, meaning from / by:

• להתרשם מ־משהו = to be impressed by something
• literally, to be impressed from something

So:

• מהתמונה = from the picture / by the picture

Also, מ־ combines with the definite article ה־:

• מ + התמונה → מהתמונה

This is a very common Hebrew contraction.

מיד means immediately / right away.

In this sentence:

• היא התרשמה מיד מהתמונה
• she was immediately impressed by the picture

Its position is natural because it modifies the verb התרשמה. Hebrew adverbs like מיד are fairly flexible, but this placement is very common and natural.

For example, Hebrew could also sometimes move it for emphasis, but the given order is standard and smooth.

Yes. Hebrew often expresses present-time ideas with an adjective or noun phrase and no verb to be.

So:

• קשה לי להבחין... means It is hard for me to distinguish...
• understood as present-time or general-time from context

Hebrew normally does not use a present-tense form of to be in ordinary sentences like this.

So even without a verb like is, the meaning is naturally present.