>>887 I have to say that this one draws my eye and my attention more than the others, but not for the lack of clothing. The pose is just a touch more dynamic, and a little more interesting to the viewer. It's definitely something to take into consideration when doing pinup style work. You tend to have less or no background to work with and to draw the overall fluidity of the work to one or more central points of focus, so you really have to try to vary up poses to make them a touch more interesting than in a full piece. Though, if you combine both concepts of a point of interest along with a background that flows toward that central focus, you've put together a nice working piece.
All in all, if you stick to a pinup style, just keep a few things in mind. Pose and angle count for a lot. Don't be afraid to experiment with them. Also, don't hide hands, feet, or other appendages or parts you find difficult. Actually, try drawing the focus that way.
I still do occasional full page sketch dumps focusing on particular parts of anatomy, especially hands and facial expression. It's a great tool to use to hone in and tune your own style. Also, if you get those parts down, you don't have to limit yourself to material that hides those issue points such as seems the case in >>884
All in all, keep it up! Drop a link to an online gallery if you have one as well. I'd like to see how you move along!