If you just keep studying the 'science' side of art (perspective, anatomy, coloring etc.) then you'll definitely draw like this in no time at all. Keep drawing everyday and read into these sort of things. It's really simple once you have the hang of everything. I'm not saying that I'm particularly good at the moment nor could I draw something like this right now, but all in all, it's not that hard.
Just keep practicing. It's not one of those "maybe in ten years, you'll be blah blah"-- it's more like, "maybe in a year, or six months". Depends how efficiently you work.