I wouldn't use a tom thumb on him (that's the equivilant 'crap' bit to the regular curb bit) I would look for a better bit for him to show in, especially if he is so sensitive to bit pressure.
I agree with smrobs on seeing if you have friends who can borrow you some bits to try on Bear so you have an idea of what he might like, then purchase that bit, or something like it.
As far as how he looks, he's definitely tense, so you'll need to work on getting him to relax more, and not brace against the bit. You don't want his head really low; his poll should be even with his wither, or even slightly above it.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."
Last edited by mom2pride; 12-19-2009 at 08:02 PM.