I won`t tell you which one I like the most, but A & F seems OK.
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There`s a small suggestion, generally just anti-aliasing:

:2X
I`ve used the same number of colors as you, but still don`t know if I hadn`t mixed up anything. It was something around 3 AM and I`m just learning all those pixel techniques. Zoom it up to see what has been changed.
I would also suggest you adding some design to his shirt, plus some folds to make more natural look.
It was funny to do and I hope it will be even a bit helpful.
Good luck!
---
There`s a small suggestion, generally just anti-aliasing:


I`ve used the same number of colors as you, but still don`t know if I hadn`t mixed up anything. It was something around 3 AM and I`m just learning all those pixel techniques. Zoom it up to see what has been changed.
I would also suggest you adding some design to his shirt, plus some folds to make more natural look.
It was funny to do and I hope it will be even a bit helpful.
Good luck!