I love your name, one of my old mares name was Tequila Sunrise.
As far as improvment you should drop your heel and relax! Your lower back looks so dense which is causing your horses back to tense and not round. I still sometimes have this problem bc I have a back problem so just try to think about that and once you relax it will supple your horse and will be more willing to round and give to the bit.
"The horse you get off is not the same as the horse you got on; it is your job as a rider to ensure that as often as possible the change is for the better."