Erich,
I think that these drawings are good practice, but I think it’s less important to try to do ‘finished’ drawing of figures in your case than it is to really dig in and explore structure.
There is definitely a difference between drawing for the sake of doing a ‘nice drawing’ and drawing for the sake of Analysis. I would really emphasize to anyone who is in the process of learning to improve their drawings that Analysis is more important than trying to do a finished work.
Also be careful of the Reference from which you draw. I see people drawing from rather non~artistic sources ~ such as the photographs of women from the web, which to my mind are more about the showcasing of attractive women than they are about art ~ and this focus in the Reference photos is reflected in the resulting images drawn or painted from them. Not to say that it’s bad to draw from these kinds of photos ~ it’s just to say that I think it’s not the best. Hong’s site has better photos, I think, or sites like:
http://www.3d.sk/
are more artistic in focus.
I don’t remember if you do or do not have Burne Hogarth’s books (Dynamic Figure Drawing, Dynamic Anatomy, etc.) but I would recommend them to anyone ~ it’s not to say that I think people should draw like him ~ I don’t ~ but he breaks form down in such a clear way that it’s a great source from which to learn how to achieve structure and dimensionality in your form.
If you’ve not already done so, check out the following thread:
Anatomy Thread of Thomasphoenix
http://forums.cgsociety.org/showthread.php?t=296477
Siju / Thomasphoenix is a great draughtsman who has really followed Hogarth and incorporated it into his own style.
EDIT:
I would also recommend to anyone participating in our Open Figure Drawing Workshops, all of which are listed here:
Open Figure Drawing Workshops with Hong Ly and Rebecca Kimmel
I think it’s a really great way to improve your work in a group setting, with lots of encouragement and feedback. 
Hope this helps. 
Cheers,
~Rebeccak