Others that your shoulders being a little rounded, you look good. To help with his bending, I have two exercises I use while warming up. First one is done at the halt. While standing still with proper rein contact, pick one side and weight your seat bone on that side a little more and take a little more contact with the rein on that side. (indirect rein works too) You're looking for just his eye and nostril, no need to bring his whole neck around. Once you have flexion to one side, ask on the other. Repeat about 5 times on each side until he gives to the flexion softly as soon as you begin to ask for it. The second exercise builds on the first. At the walk on the railing, weight and slide your inside seat bone forward. Ask for rein flexion at the same time on that side. The result should be a shallow turn to the inside. Complete a shallow serpentine by doing the same on the opposite seat bone and rein to get you back to the railing. Once your horse gets what you're asking for, try to do it with as subtle aids as possible. Some will give you the whole flexion ball of wax with just a slight seatbone adjustment. It's the beginnings of communicating with your horse solely through your seat. Both exercises should help him soften and bend better around your leg. Good luck. Cute horse!