hey thanks! I'm not quite certain how to explain making hair look volumous, but I'll try!
So basically I think about hair like ribbons, just long flat pieces of fabric that may curl depending on how curly the hair is. I don't like to think about all the strands of hair, rather I think it's helpful to lay down some big ribbon-like shapes, and then work in the smaller details (some stray strands here and there) to add a more hair-like effect. If you want volumous locks, I think it's just important to make sure the hair doesn't hug the head too much... give it some "room to breathe". Hair has been incredibly difficult for me to get a handle on, but with practice and some patience, things do improve!
I hope this helped a little at least. I'm not too great at explaining how I do hair with words, perhaps when I'm confident enough, I can post up a video on it.
If you have any more questions, please do let me know! I'm always happy to help!
Very pretty colors! I've been trying to get into painting with brighter colors myself, but I always end up back in the darker side of things, LOL! But again this is lovely, its got a nice pastel's feeling to it also (the medium I mean, not just the color pallet), great work.
It definitely takes a buttload of practice! Believe me, I can very honestly say that I was ridiculously bad at rendering a while back, but it's really just about sticking it through and trying to learn and observe as much as you can. If you really just focus on trying to master anatomy, colour, and lighting, you'll be able to render well soon enough!
Remember, nobody starts off knowing exactly what to do to make a drawing look believable, all the amazing artist you see out there got there through perseverance and a craptonne of practice.