I can't really see a problem with the edge. To be honest, I'm not sure what could be done to the edge to fix the issue you're having. It looks okay to me...
If you're feeling wary about it, then it might be a good idea to enlarge him and move him to the right (enough to eliminate the white space on the right side of the panel). That might make the composition a bit stronger, so I reckon it's at least worth a look.
Maybe adding some wrinkles and shadow on the clothes would help a bit as well? Making the shadows toward the middle of his body a bit darker may help to emphasize that eye even more too.
I'm not sure if this helps. Maybe if I throw a few things at the wall we can figure out what exactly is bothering you about this panel.