I really like your little horse. It's always nice to see someone buy a horse that seems right for them. I think you look a little stiff, as though you fight to maintain your position, which falls apart a little bit on your approach. (Note some slight body pumping, drop of your left hand to ineffectively correct a drift). In my opinion, good things to work on would include keeping your horse centered between your aides in a lateral sense, ie inside leg to outside hand. Otherwise it seems like you have a good trainer, and learning to ride a new horse well takes time. Congrats!