Ya tenemos elegida la primera ilustración, aunque todavía dudamos sobre el color de la portada.

Ya often means already, but in Spanish it can also add the idea of now / at this point / by now.

So Ya tenemos elegida la primera ilustración suggests:

• the choice has been made already
• this step is now completed

It gives a sense of progress in a process: one thing is settled, but another is still undecided.

This is one of the most important things to notice in the sentence.

• Hemos elegido la primera ilustración = We have chosen the first illustration.

  • This focuses on the action of choosing.

• Tenemos elegida la primera ilustración = literally something like We have the first illustration chosen.

  • This focuses on the resulting state: the illustration is now in a chosen state.

The pattern here is:

tener + noun + past participle used adjectivally

Examples:

• Tengo preparada la maleta. = I have the suitcase ready / packed.
• Tenemos reservadas las entradas. = We have the tickets booked.

So tenemos elegida emphasizes that the decision is already in place.

Because elegida agrees with la primera ilustración, which is:

• feminine
• singular

In this structure, the participle behaves like an adjective, so it must agree with the noun:

• el dibujo elegido
• la ilustración elegida
• los dibujos elegidos
• las ilustraciones elegidas

That is different from the normal perfect tense with haber, where the participle does not change:

• Hemos elegido la ilustración
• Han elegido las ilustraciones

Yes, absolutely.

Both are grammatical, but they highlight slightly different things:

• Ya hemos elegido la primera ilustración
  Focus: the action of choosing has happened.

• Ya tenemos elegida la primera ilustración
  Focus: the illustration is now in the state of being chosen; the task is taken care of.

In context, tenemos elegida can sound a bit more natural when talking about a project with several pending decisions.

Aunque means although / even though, and it introduces a contrast in a more subordinate way.

Here the idea is:

• one thing is already decided
• another thing is still uncertain

So:

• Ya tenemos elegida la primera ilustración, aunque todavía dudamos sobre el color de la portada.

This is like saying:

• We already have the first illustration chosen, although we still have doubts about the cover color.

If you used pero, the sentence would also be possible in many contexts:

• ..., pero todavía dudamos...

But aunque sounds a little more like despite that fact.

Todavía means still.

It shows that the doubt continues up to the present moment:

• todavía dudamos = we still have doubts / we are still unsure

Without todavía, the sentence would still be correct:

• aunque dudamos sobre el color de la portada

But todavía makes it clearer that this issue remains unresolved.

Yes. Dudar can be used in a few different ways.

Here, dudar sobre means something like:

• to be uncertain about
• to have doubts about

So:

• dudamos sobre el color de la portada = we’re unsure about the color of the cover

Other common patterns are:

• dudar de algo/alguien = to doubt something/someone

  • Dudo de su versión. = I doubt his/her version.

• dudar entre dos opciones = to hesitate between two options

  • Dudamos entre el rojo y el azul. = We’re hesitating between red and blue.

In this sentence, sobre works well because the doubt concerns a topic: the color.

Portada usually means cover or front cover, especially for:

• books
• magazines
• notebooks
• albums

So el color de la portada is the color of the cover.

Depending on context, portada can also mean a front page or main image/page, but here it clearly refers to the cover of something being designed or published.

Because color is a masculine noun in Spanish:

• el color
• un color
• este color

So:

• el color de la portada = the color of the cover

Even though some English speakers may expect it to be feminine because of words like colour having no gender in English, in Spanish it is masculine.

The comma separates the main idea from the contrasting clause introduced by aunque.

Structure:

• Ya tenemos elegida la primera ilustración
• aunque todavía dudamos sobre el color de la portada

This punctuation is very natural because the second part adds a contrasting comment.

You may see some variation with commas in short sentences, but here the comma helps readability and sounds completely standard.

Usually it means the first illustration in an ordered set, sequence, or project.

Depending on context, it could mean:

• the first illustration in a book
• the first illustration among several being considered
• the first one to be worked on or selected

Nothing in the phrase itself tells you exactly which kind of first it is; the context does that.

Yes, but it would sound a little different.

• todavía dudamos = we are still unsure / we still have doubts
  This is the more neutral and natural option here.

• todavía estamos dudando = we are still in the process of hesitating / still currently wavering
  This puts more emphasis on the ongoing process.

In many cases, Spanish prefers the simple present where English might use a continuous form. So todavía dudamos is very idiomatic.