Composition: I like the way your arms frame your face.
Lighting/Exposure: Lighting is very nice. I look forward to seeing what you do w/this lens!!
Pose: Standard photographer pose. Nice hand cradling the lens there.
Suggestions for Improvements: I would crop this. To just above your head on the top and to just above your elbow on the bottom. When I do it with my hands, it looks much better. Brings your face into the limelight. :)
This is a very candid self portrait. Those come along rarely. :) Keep it up!!