Hey @big-misch!
Drawing is very important, it is the structure and the very core of paintings, I realized this a few years ago when I had gotten a tablet way too early. Since then, I've spent far more time drawing than painting, and when I do occasionally paint, it is for fun and to see how much I've developed!
As for mixing in a few studies, what exactly do you mean? I would've thought that this is it?
Also, thanks for your compliment! 3D is really fun and it'll only be more needed in the industry as time goes forward, so it wouldn't hurt to play around with it!