So I've been wanting to do this for a while but haven't made the time until tonight. I'm beginning to study gradient meshes in Adobe illustrator. This here is my first attempt. It's nothing special, I know. I didn't go near as far as I would've liked for a finished product; but, it's just a sketch, and there'll be more soon. It's not my favorite technique in the world (to be honest I'd rather just paint the apple) but a good weapon to have in my arsenal none the less.