Fit: good, really good. The on at the tip look either too big or slightly out of round, but only by a little. You also mentioned the centerband fit, but those can be tricky when the centerband ends in a bead.
Finish: top half looks amazing, and the bottom half looks dull at points. With a little more practice I'm sure you will work that out.
Form: I like the shape, but the bottom half seems a little to big to me, it would be great with a little less bulge. But if you like it, that's all that matters!
Eye-apeal: can't ever miss with cocobolo and chrome! It's also a nice touch to line up the grain, I can't tell if you did that then twisted it before the picture or not.
If this is your first pen, then you are going places! Can't wait to see what you can do a year from now! Be sure to save the first pen!