Good stuff! The legs are a little bit confusing I think, it's hard to make out what's going on and how she is standing. Maybe try to enlarge the canvas and draw the complete pose (and crop it afterwards) to get a better feeling for the pose? Just thinking out loud!
Great start for a great sketchbook! your posts are so loaded with pictures!
You must be working all day to get this amount of work done, and its already showing. From your first post to your last one you already seem to be getting better!
And usually it takes pages of a sketchbook to see that kind of progress
I've got one critique for you right now. Might be able to come up with more later.
When I see you using dark colours in your painting. I see you quickly jumping towards black without any colour in it. This way the painting gets flattened.
When looking at artist wich are great with light/dark you seem them using much more different colours in their dark areas.
Look at this painting made by Rembrandt for example. http://1.bp.blogspot.com/--TiHvKUout...brandt%2B3.jpg
He is using magneta purple in his dark areas wich already gives the painting a lot more depth.
Just something I want you to think of next time you are grabbing black on your colour pallete for your shades
Luckers: Thanks for pointing that out, will make a big difference!
i'm aware that you shouldn't use pure white or black and usually go for some sort of color in the higlights and darkest darks,
perhaps changing rbg web to rgb monitor to prevent darkening images when posted on the web might help aswell.