The only things that really worry me are the chracks(checks, wind shakes) at the handle and that one knot on the edge of one limb.
What I would do is concentrate on each limb individually then when each is acceptable work on the hole bow all together. And, I would use dry heat with oil. For the knot on the edge of the limb I would try to eliminate it if possible. I believe you should be able to remove it and still have plenty of width.
Check out my build along in last years Bow Trade. It took me quite a while and many heating and clampings to get "Flip Flop" lined up to complete the tiller.
If you take your time and think out each move this stave will teach you a lot about osage and wood bows in general...even if it is not a successful bow when it is all over. It will be worth every minute you spend on it , just for the experience.