That doesn't help anyone improve though. There's nothing really that wrong with it, but it can be improved.
I can see what appears to be a wrinkled black cloth backdrop, and it looks a little messy, and what makes it worse, is the JPEG compression has also made it look blocky,,, so it's quite unpleasant. How are you JPEGing these? Moving your model away from the backdrop is essential if you don't want a black backdrop to show... of flag off lights better.
It's hard to tell at this size, but it may not be sharp.. but that could be how you've resized the image for screen. However.. using a manual focus lens on a digital SLR is a pain in the ass unlike the ground glass screens of manual focus SLRs. You using live view to focus?
The hair light it too bright IMO, and seems a little out of place against the relativey flat lighting for your main light. A hair light on both sides, and the main light dropped a stop would have had more drama I think.