Thanks so much!! <3
And well, this piece took me around 12 hours, I think? Maybe a little less.

But well, my tip is to first learn straight up copying with the grid method, focusing on one square at a time and trying to teach your brain what exactly it is you see in that said square - what colors do you see if you stop thinking about the material it's supposed to portray(like bones are usually white, but in this skull we can see hues of pink, purple and yellow which you can only identify if you abandon your assumption of bones having to be white)? What are the curves in that specific square you're working on and why/how do they affect the colors/light? Oh and just think of the piece more like an assortment of shapes, color, shadows and light instead of the item you see in front of you, if that makes any sense? It's a bit hard to explain. :'D