My wife let me have a go at blending, with her water soluble oils.
Basically oil-like in that you can mix colour tones but no need to fuck about with turpentine and they don't take so long to dry.
But not got that plasticky sheen like acrylics.
They smell awful, god only knows what's in them.
But otherwise nice to work with, can leave them to dry overnight, chuck a bit of water on in the morning and they come back alive.
This is not observational from a real leaf, it's a version of a watercolour by Rory McEwen, master botanical artist.
The original leaf is part of a sequence called "True Facts from Nature"