zhuzhu,
Nice! Her bottom is still a bit large, but of course I like your watercolor technique. Might I may make a radical suggestion? I think it might be good if you focused a bit less on the (beautiful) watercolor technique which you have developed, and go a bit more into linework. I only suggest this because I think it will make your lovely watercolor paintings that much better. Just a suggestion. 
Zepyhri,
WOW!!! I just cannot wait to see where you go with this piece! Once you detail the wings, resolve the column and just generally work up this piece, it is going to be really nice. Definitely try to continue to work up the piece as a whole as you have done so far. Please continue to post your results! 
Kha,
Nice work so far!! I think that the main thing that I would say at this point would be to try to make your lines a bit less stiff. Traditional work is harder to go back into and adjust than digital work, so I would suggest even doing another drawing of the same pose. The advantage is now you are familiar with the pose, and the confidence which you have gained from doing this first drawing will allow you to relax your lines a bit in a new drawing.
Hope to see more updates of your work!! 
amy_517,
You are more than welcome, and I am glad to see that everyone here seems to really be benefitting from the group interaction and from seeing others’ work! You know, with respect to the “cheating” thing, that line is really blurred in the digital age. Is it ‘cheating’ in 3D to create a perfectly rendered sphere in under a second? Not really, you’re just using the medium as it should be used. Old Masters “cheated” by using grids. There have always been and always will be devices for “cheating” which help us to accomplish our work. I absolutely don’t endorse tracing and trying to pass it off as your own work ~ THAT is cheating. Taking the occasional measurement, or tracing FIRST to have a general understanding of things or as practice, I actually endorse. So it’s really up to the individual to decide where that line is, and how honest they wish to be. 
Queensoul,
WOW!! I think you have gotten a great start with this!
Now, granted there are problems which others are free to give advice about. But I think your relative proportions are really decent. You have made her a bit shorter and stockier than the reference photo, but I am certainly a proponent of taking artistic license. Generally speaking I use the model as a vehicle for expression ~ I rarely if ever try to copy the model exactly. That is just me, and I love to see the fully representational work of others. The point is, do what you like, so long as you feel in control of the process.
Keep going with this. Save versions, and post your results!! 
~Rebeccak