Just popping in to say I have no clue about your horse's breed, but you really need to readjust your bit, as every photo shows it cranked too far back. It's not effective, yet it is extremely harsh, in that position. Your curb chain should be tight enough that you can't pull the bit past an approximately 60-degree angle with the mouth. And honestly, I hate hate hate Tom Thumb bits, anyway, but that's another discussion entirely. You'll have much better control and finesse, and a happier horse, if you at least tighten your curb but preferably change out bits entirely.