I love the starkness of this! It bears a slight resemblance to something I was going to attempt but ran out of time. You did a much better inerpretation than I would have. :)
I like the line of your arm. This picture wins points for it's simplicity. Even though it's a silhouette, I get a feel for your character from the way that you're sitting, and how your'e facing your camera. Great shot.
I do like the idea of a self-portrait of taking a self portrait.. however, the shadow only choice here is a little too rough for me. For this style to work well, I think the framing or some other element would need to make the image more interesting.
I like your concept but the silhouette isn't crisp. It looks too computer generated rather than being a photo. Maybe it's a problem with my monitor more than your picture, but it is distracting.
I like the less than 'self-conscious' approach and appreciate the intended (and achieved) silhouette. The figure profile clearly retains individual features. The chair reveals an epoch without adding any 'baroque' distractions, and the converging rungs and arch add a (needed) graphic element.
My eye, however, would prefer a less central composition...