У неё тёмные брови и длинные ресницы, поэтому она редко красится ярко.

Russian usually expresses possession with the pattern у + genitive + noun, literally something like at her there are...

So:

• У неё тёмные брови и длинные ресницы = She has dark eyebrows and long eyelashes

Using иметь (to have) is possible in Russian, but it is much less common in everyday speech for this kind of simple description. A sentence with она имеет would sound formal or unnatural here.

Because the preposition у requires the genitive case.

The pronoun changes like this:

• она = she
• её / неё = her

After у, you say:

• у неё = at her / she has

The form неё appears because the pronoun is used after a preposition. This н- is normal in forms like:

• у неё
• к ней
• с ней
• от неё

Because they describe plural nouns:

• брови = eyebrows
• ресницы = eyelashes

Russian adjectives must agree with the noun in gender, number, and case.

So here:

• тёмные брови = dark eyebrows
• длинные ресницы = long eyelashes

Both nouns are plural, so both adjectives are plural too.

No. They do have singular forms:

• бровь = eyebrow
• ресница = eyelash

But in real life, people very often talk about them in the plural because we usually mean both eyebrows or eyelashes in general.

So:

• У неё тёмные брови = She has dark eyebrows
• У неё длинные ресницы = She has long eyelashes

That sounds very natural.

Поэтому means therefore, so, that’s why, or for that reason.

In this sentence, it connects the two ideas:

• she has dark eyebrows and long eyelashes
• as a result, she rarely wears bright makeup

So поэтому signals a consequence.

Very natural English translations here would be:

• so
• that’s why
• therefore

Because it connects two clauses:

• У неё тёмные брови и длинные ресницы
• поэтому она редко красится ярко

Russian normally puts a comma before поэтому when it introduces the result of the first clause.

So the comma helps show the structure:

[fact], therefore [result].

Here красится comes from краситься, which often means:

• to put on makeup
• to wear makeup
• to do one’s makeup

The ending -ся is part of the verb. In many contexts, красить means to paint / dye / color something, while краситься means doing that to oneself or using makeup.

Compare:

• Она красит волосы. = She dyes/paints hair.
• Она красится. = She puts on makeup / does her makeup.

In this sentence, красится clearly means wears makeup / makes herself up.

In Russian, the present tense is often used for habitual actions, just like in English:

• Она редко красится ярко. = She rarely wears bright makeup.

It does not mean only right now. It can describe what someone generally does or usually does not do.

So this is a normal way to talk about a habit.

Редко means rarely.

It modifies the verb красится, so:

• она редко красится = she rarely puts on makeup / she rarely wears makeup

It tells you the frequency of the action.

Ярко is an adverb meaning brightly.

It modifies the verb красится, not a noun. So Russian is saying something like:

• she makes herself up brightly
• more natural English: she wears bright makeup

Russian often uses an adverb where English prefers an adjective + noun phrase.

So:

• красится ярко = puts on makeup brightly / wears bright makeup

This is perfectly natural in Russian.

Russian word order is flexible, but not every order sounds equally natural.

The original:

• она редко красится ярко

is natural and clear.

You may also hear:

• она редко ярко красится

This is also possible and may sound a little more compact.

But:

• она ярко редко красится

sounds awkward, because редко usually stays closer to the verb or the whole verb phrase.

So the original order is a good standard choice.

Because in the present tense, Russian normally does not use a present-tense form of to be.

So instead of saying something literally like At her are dark eyebrows and long eyelashes, Russian just says:

• У неё тёмные брови и длинные ресницы

This is the normal Russian structure for possession in the present.

Yes, depending on context, ярко can suggest:

• brightly
• boldly
• vividly
• sometimes even a bit flashily

In this sentence, the idea is probably that because her features are already naturally strong or noticeable, she does not usually choose bright / bold makeup.

So ярко here is best understood as in a bold, bright way rather than simply with a lot of color in a neutral sense.

Краситься here is imperfective.

That matters because the sentence describes a habit or repeated behavior:

• она редко красится ярко = she rarely wears bright makeup

Russian uses the imperfective for:

• repeated actions
• general habits
• ongoing processes

A perfective verb would not fit as naturally here, because the sentence is not about one completed act of putting on makeup, but about her usual behavior.