Looks good. I shoot my selfbows at least 100 times before I finish them. The tiller will often change as the bow is shot in. Also it might just be the angle of the picture but the top limb looks like it has a flat spot about midlimb before you get to the knot? I agree with leaving it stiff around the knot, but it isn' t necessary to leave it stiff leading up to it. How many bows have you made? Regardless congrats on a great looking bow. Where did ya get Python skins?

Here are a few pictures of the first BBO I made.

http://users.zoominternet.net/~mas/bbo.html