I think he looks greatly improved; great job with him!
As far as your size in regards to him, I disagree with the above poster who said you are an improper fit to him. I have seen plenty of 14hh QHs carrying 6ft tall 250lb men around all day on cattle ranches. Your boy obviously has decent bone, and once filled out will have more than adequate weight and muscle to withstand your weight. You look fine on him.