Wow, guys, some really great work going on here! 
danielh68,
Welcome to the Anatomy forum! Good to see you here. :)
allenatl,
Great start so far!! I would say, keep the linework for the time being. It’ll be a good guide, but don’t be completely dependent upon it ~ and, if you see something new, alter it by cutting, pasting, and tweaking it to taste, or by simply redrawing it. Good to see you keeping the piece with as few colors as possible so far…I would get the values in order first, and then gradually introduce color…or you may wish to use blending modes to introduce color over a completely grayscale image. Choose the method with which you feel the most comfortable.
The other thing I would advise would be to give her more of a neck ~ right now, her head is sitting a bit low, and if you draw a more elongated neck and a fully articulated head without the hair, you will see that her neck needs to be longer to match the proportions of her body.
Good luck, and looking forward to your update! 
Llynna,
Great to see you working only in Grayscale! I would caution against using the same white everywhere for highlights ~ tho you can easily tone these down with a low opacity layer filled with gray over parts of the figure. Use more contrast between light and dark to draw attention to specific areas of the figure, and use less contrast to lessen the visual importance of others.
I would also suggest stepping back and looking at your painting from the standpoint of doing a drawing, and rethink the lower portion of the figure. As have most folks who have chosen this pose, you have made the buttocks and thigh far too large for her upper torso. So I recommend doing a new line drawing on a new layer to re~think the proportions.
But great start, and keep going, and post your results! :)
zhuzhu,
Nice to see your traditional work! I don't think I've seen it before, so it is a refreshing change. :)
I think her left arm is a bit thin. Her lower right arm is a bit short, I believe. There are just a few minor problems which could be fixed ~ I’ll do a short review later, tho your work is really beautiful! 
DrakeX,
Glad to see you posting your work! :) I would recommend taking a look at the first part of [b][Lesson 002: Opposing Curves](http://forums.cgsociety.org/showthread.php?t=255700)[/b]. I think that the key missing ingredient to your drawing is rhythm and flow, which can be easily introduced by offsetting the major curves of the body in a rhythmic fashion. You have a good start here, and I'd like you to take a look at Lesson 002 briefly, and then try to rework your first image. If you have any questions, don't be shy about asking ~ it's what we're all here for! :)
Great stuff, guys, and keep it up! :bounce:
~Rebeccak