Mi tía usa esmalte rojo cuando quiere arreglarse un poco más.

Mi tía is the normal, everyday way to say my aunt in Spanish.

Spanish usually puts possessive adjectives like mi, tu, su, nuestro before the noun:

• mi tía = my aunt
• tu casa = your house

The longer pattern la tía mía is much less common and sounds more emphatic, poetic, or marked. A learner should normally use mi tía.

The accent mark shows the stress: tí-a.

Without the accent, Spanish spelling rules would suggest a different pronunciation. The written accent helps show that the í is stressed and forms a separate syllable from a.

So:

• tía = TEE-ah
• not one blended syllable like tia

This is very common in words where a weak vowel like i or u is stressed next to a, e, o.

Usa is the present simple, and in Spanish this tense is often used for habitual actions or things that are generally true.

Here, the sentence means something like:

• she wears/uses red nail polish when she wants to dress up a bit more

That sounds like a repeated habit, so usa fits well.

Está usando would mean she is using/wearing it right now, at this moment, which is not the idea here.

After verbs like usar, Spanish often leaves out the article when talking about something in a general way.

So:

• usa esmalte rojo = she wears/uses red nail polish

This does not focus on one specific bottle or one specific instance. It is just describing what she uses.

You could sometimes hear:

• usa un esmalte rojo

but that would sound more like a red nail polish, perhaps one particular kind or one occasion.

In Spanish, most adjectives normally come after the noun.

So:

• esmalte rojo = red nail polish
• coche blanco = white car
• camisa azul = blue shirt

This is one of the big differences from English, where color adjectives usually come before the noun.

Here esmalte means nail polish.

The word esmalte can also mean enamel in other contexts, so the exact meaning depends on the sentence. Because the sentence talks about arreglarse and uses the color rojo, the intended meaning is clearly nail polish.

In Spain, esmalte de uñas is very common for nail polish, and sometimes esmalte alone is enough when the context is clear.

Here cuando means when in a habitual or repeated sense, so Spanish uses the indicative:

• cuando quiere arreglarse un poco más

This means something like when she wants to make herself look a bit nicer.

Use the subjunctive after cuando when talking about a future event that has not happened yet:

• Cuando quiera arreglarse, usará esmalte rojo.
  = When she wants to dress up, she will wear red nail polish.

So in your sentence, quiere is used because it describes a usual pattern, not a future one.

Arreglar by itself usually means to fix, to arrange, or to tidy something.

• arreglar el coche = to fix the car
• arreglar la habitación = to tidy the room

But arreglarse is reflexive and often means to get ready, to make oneself look nice, or to dress up/groom oneself.

So:

• quiere arreglarse = she wants to get herself ready / make herself look nicer

That -se is important because the action is being done to herself.

No. In a structure with a conjugated verb plus an infinitive, the reflexive pronoun can go:

1. before the conjugated verb, or
2. attached to the infinitive

So these are both correct:

• se quiere arreglar
• quiere arreglarse

But quiere se arreglar is not correct.

In your sentence, quiere arreglarse is perfectly natural.

Un poco más means a little more or a bit more.

The comparison is implicit. Spanish often leaves out the second part when it is understood from context.

Here it means something like:

• a little more than usual
• a little more than on ordinary days
• a little more elegantly / carefully

So she wears red nail polish when she wants to make a slightly bigger effort with her appearance.

It can mean both, depending on context.

Arreglarse can refer to:

• getting ready
• doing your hair or makeup
• making yourself look presentable
• dressing up a bit

In this sentence, because of un poco más, it suggests making herself look a bit nicer than usual, not just basic getting ready.

So the sense is closer to:

• to make herself look a bit more put-together
• to dress up a little more

Yes, and it would sound very natural.

There is a slight difference in focus:

• usar esmalte rojo = to wear/use red nail polish as a habit or style choice
• ponerse esmalte rojo = to put on red nail polish

So:

• usa esmalte rojo focuses on what she wears
• se pone esmalte rojo focuses more on the act of applying it

Both are possible, but the original sentence is talking about her usual choice when she wants to look a bit nicer, so usa works well.

Spanish often leaves out subject pronouns because the verb ending already shows who the subject is.

• quiere already tells us it is she/he/you-formal
• the context gives us mi tía, so there is no need to say ella

So Spanish prefers:

• Mi tía usa esmalte rojo cuando quiere arreglarse...

rather than:

• Mi tía usa esmalte rojo cuando ella quiere arreglarse...

Adding ella is possible, but usually only for emphasis, contrast, or clarity.

Yes, very closely.

Más means more, and in un poco más it gives a comparative idea:

• un poco = a little
• más = more

Together:

• un poco más = a little more / a bit more

Spanish uses this structure very often, just like English:

• más grande = bigger
• más rápido = faster
• un poco más elegante = a little more elegant

In your sentence, the adjective is not stated, but the meaning is understood from arreglarse.