Después de haber revisado el informe, me siento más tranquilo.

Both are possible.

• después de revisar el informe = after reviewing the report
• después de haber revisado el informe = after having reviewed the report

The version with haber + past participle is the perfect infinitive. It emphasizes that the review was completed before the person feels calmer.

In everyday Spanish, después de revisar el informe is often more natural and common. The longer form, después de haber revisado, sounds a bit more explicit or slightly more formal.

Haber revisado is the perfect infinitive.

It is formed with:

• haber
  • past participle
• here: haber revisado

This structure expresses an action that is already finished before another action or state.

So in this sentence:

• haber revisado el informe = to have reviewed the report

It works a bit like English having reviewed or to have reviewed.

Because después de is the fixed expression meaning after when it is followed by a noun or an infinitive structure.

Examples:

• después de la reunión = after the meeting
• después de comer = after eating
• después de haber revisado el informe = after having reviewed the report

But when a full clause with a conjugated verb follows, Spanish usually uses después de que:

• después de que revisé el informe
• después de que revisaron el informe

So de is required here because it is followed by an infinitive phrase, not a full finite clause.

Because the verb here is sentirse, which means to feel in the sense of to feel emotionally or physically in a certain state.

• me siento tranquilo = I feel calm
• se siente cansado = he feels tired

Without the reflexive pronoun, sentir usually means to feel something or to regret:

• siento frío = I feel cold
• siento que algo va mal = I feel that something is wrong
• lo siento = I’m sorry

So:

• me siento más tranquilo = I feel calmer / more reassured

Because it agrees with the person who is speaking.

In me siento más tranquilo, the adjective describes I, so it must match the speaker’s gender and number.

If the speaker is:

• a man: me siento más tranquilo
• a woman: me siento más tranquila

If more than one person were speaking:

• mixed group or all men: nos sentimos más tranquilos
• all women: nos sentimos más tranquilas

Yes, literally it means calmer, but in context it can also mean:

• more at ease
• more reassured
• less worried

So me siento más tranquilo often suggests that checking the report has reduced anxiety or uncertainty.

It does not necessarily mean the person was visibly agitated before; it can simply mean they now feel better about the situation.

Yes, absolutely.

Both word orders are correct:

• Después de haber revisado el informe, me siento más tranquilo.
• Me siento más tranquilo después de haber revisado el informe.

The first version puts more focus on the time/background action first. The second starts with the main point: I feel calmer.

Spanish word order is flexible, especially with introductory time expressions like después de...

Because Spanish usually leaves out subject pronouns when they are clear from the verb ending.

• me siento already tells you the subject is I
• so yo is not necessary

You could say:

• Yo me siento más tranquilo

but that usually adds emphasis, contrast, or clarity. For example:

• Ella sigue preocupada, pero yo me siento más tranquilo.

In a neutral sentence, omitting yo is more natural.

Because this sentence does not contain a structure that requires it.

Here, después de haber revisado el informe uses an infinitive phrase, not a clause with a conjugated verb. No subjunctive is needed.

You would use a conjugated verb after después de que, and then the choice of tense/mood depends on context:

• Después de que revisé el informe, me sentí más tranquilo.
• Después de que haya revisado el informe, me sentiré más tranquilo.

But in the original sentence, the speaker uses an infinitive construction, so there is no subjunctive question.

Use después de que when the action after after has its own subject or when you want a full clause.

For example:

• Después de que revisé el informe, me sentí más tranquilo.
• Después de que María revisó el informe, me sentí más tranquilo.

Use después de + infinitive when the subject is the same as in the main clause:

• Después de revisar el informe, me sentí más tranquilo.
• Después de haber revisado el informe, me siento más tranquilo.

So in the original sentence, the same person both reviewed the report and feels calmer, which is why the infinitive structure works well.

It is very common and helpful, because Después de haber revisado el informe is an introductory phrase.

So:

• Después de haber revisado el informe, me siento más tranquilo.

is the standard written version.

In shorter sentences, Spanish sometimes omits such commas, but here the comma makes the structure clearer and more natural in writing.