How to Say "further details" in Spanish
The Spanish word for “further details” is “ampliación” — B1 level. This is a very common word in everyday Spanish.

Examples
Necesito una ampliación de esta fotografía para el salón.
I need an enlargement of this photo for the living room.
El director pidió una ampliación del plazo de entrega.
The director asked for an extension of the deadline.
Las obras de ampliación del hospital terminarán el próximo mes.
The hospital's expansion works will finish next month.
Always Feminine
In Spanish, almost every word ending in '-ción' is feminine. Even if it sounds like it should be masculine, always use 'la' or 'una' with ampliación.
From Action to Result
This word describes both the act of making something bigger and the actual new part that was added.
Extension vs. Ampliación
Mistake: “Using 'extensión' for a photo print.”
Correction: Use 'ampliación' for photography. 'Extensión' is usually for physical length or telephone lines.
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