Exactly what rmbonham said. The handle should be made to fit the hand, and for its designed purpose. A paring knife needs a smaller handle, not for aesthetic reasons, but because the way a paring knife is used requires more dexterity than a firm grip. Big choppers have bigger handles because they are easier to hold onto when chopping, not because they look better with bigger handles. If that handle feels good for what the knife is intended to do, then its the right size. If it feels like it needs to be bigger, then it probably does. Same goes with smaller. I would handle the knife quite a bit with my eyes closed, and then do some testing to see how it performs before deciding one way or the other.
I'm a big fan of that handle design, and the knife looks great overall to me. That wood looks really nice, and the guard looks great, too. I cant wait to see it finished! are you gonna put a deep etch on the wrought?