Needs a little more shading... But this is fucking awesome try to redo it!
For first time piece I can't say there are many flaws a first timer would not make.
The style is excellent and you say this was your first time working with the medium... Right!
The pose is awsome I don't see any mistakes I would make in the foreshortening and prospective...
Needs a background you could have dropped one back there and it wouldn't take much work!
Over all I will give all five!