¿Cuáles son las diferencias entre escultura y estatua?
An 'escultura' is everything made by a sculptor (escultor).
An 'estatua' is a type of 'escultura', it represents something real (like a human, a horse, etc), it's usually made of stone. Most of the 'esculturas' in parks are 'estatuas' of somebody.
I'm not 100% sure because I don't know much about art, but I think that's the difference