Wow, these are great! I disagree with MrMister's points. I'd say facial expression, hat and goggles are all improved in the second one.
Outlines might be a little too soft for some backgrounds, especially the wrench. But then again, it could work. Just throwing ideas out there. Gloves and coat seem a little flat. Though they still look good. Leg doesn't appear to be shaded well, the highlight looks sort of like a random noise pixel, or worse a tiny pillow shaded pixel, rather than highlight. To me, anyway.
Maybe darker and less saturated shadow for the hair? Could look nice, add to the definition. It looks a tiny bit muddy in that respect, that area around the hair and collar. Some AA where the brim of the hat meets the shadow of the hat could help. But really the sprites are quite splendid, well done.
EDIT: Oh, and the character read to me as a female?