I know you've decided to chuck this harness (and I'm glad you did) but just for the sake of general education....
1) The height of the front of the breastcollar is pretty good now but when you put pressure on it it will drop too low. I'd raise it at least a notch on each side.
2) The check, winkerstays and browband on the first bridle are all too tight. See how the browband is pulling the bridle into the back of his ears?
3) The throatlatch and cheek pieces look okay on the first bridle although it's hard to tell how much extra strap there may be. The second bridle is way too large, as is the bit. The winkerstays on it are a decent length if only they had wire in them to hold the blinkers out away from his eyes.
4) He definitely does not need a curb strap (they do no good on a snaffle bit) and Myrna is right that any snaps should be attached with the opening away from the horse. I learned that one in 4-H.
5) You did great putting the saddle far enough back, the girth will not pinch his elbows in that position. You'd need to take the tugs (also called the "shaft loops") up much higher to hitch him up.
6) The backstrap and crupper do look a bit too long. The hipstrap on the breeching is okay but could be a little further forward.
7) The breeching itself appears to be okay as far as length but is positioned way too low. The holdback straps also look like they are too long. (When ground-driving, connect the holdbacks to the tugs/shaft loops on the saddle rather than up to the rein terrets.)
8) Reins and traces appear to be a decent length.
With the exception of the blinkerstays and the atrociously-designed overcheck that's really pretty decent for a nylon harness. As everyone else has said however, I think you'd be much happier with the leather Ozark Pleasure harness.
Leia