I see a few things that are wrong on these mockups.
1 the brow above the windshield is much too prominent. It should only extend past the windshield the thickness of the drip rail.
2 there's a separation line missing between the roof skin and B pillar that wraps around and goes above the rear window.
3 there's a horizontal separation line missing on the bedside that should be just above the "bumpout". This generation Ford truck's bedsides were three pieces: top, bottom and the cap on the end that encases the tail lights.
4 the rear fenderwell openings on the '69 are way off. Too small and shaped wrong. They look closer on the '71, but still a touch off.
5 the bedside behind the rear fenderwells extends down too far. It should be shorter than the bedside in front of the fenderwells
6 the trim on the '71 is way too wide.
7 the grille on the '69 is wrong. The vertical bars should be evenly spaced.
8 the front bumper is too flat and square at the top. It should have a small bump out at the top.
9 the '69s side marker light is in the wrong position. It is not located in the bumpout. It should be a small rectangular light towards the bottom just in front of the vertical body line.
10The rear bumper?? Ugh! This is what it should look like.