I think 1/25 was too slow a shutter speed in the first photo, and as a result it looks shaken. Not sure if it was because of the subject was moving or whether it's because you're at 85mm, but other than that I think it's a great shot. I like how he's completely to the right.
The second photo is really nice, although the vignetting is a bit too extreme to my taste, it almost darkens the guitar. Maybe dodge the upper part of the guitar to get it to "pop" out more?
18 years old and lazy.
Canon EOS 550D - Sigma 17-50mm f/2.8 OS HSM - 50mm f/1.8 - 70-300mm f/4-5.6 IS USM