Fist is off.
The fist is crossing our field of vision directly perpendicular, while the target is flying backward at an angle. even with a haymaker or hook you're not going to get that reaction.
Off the top of my languishing art skill, you could draw a medium-large circle, with a medium one overlapping it but to the left and up a bit (smaller circle encompasses top left quadrant of big circle). Connect the non-overlapping parts with lines; that's your forearm pointing towards the target. Then add a fist in excruciating detail, erase the detail where it's covered by the arm, and swear about wasting twenty minutes instead of sawing some lumps and a line.
Finí!