Loving the personality of each drawing and also the subtle variance in line weight that gives the beards so much life. The work is not very clean compared to most other pixel art and it's clear that some transparent brushes were used in tricky spots like the reflected light, but this still captures I feel, the qualities that drew most of us to pixel art in the first palce.
Agree with Adarias: great drawings, pixeling problems (997 colors + resize issues).
You don't need to upscale your pieces as there is a built-in zoom feature. If you do, make sure to use an integer factor only or line weight will vary.