Also, watch the feet/ground line as the 1 pixel step difference really affects their viewing angle, in turn, the viewing angle consistency will make them more believable.

Hello thanks!

Yes I agree on the outlines.
The way I worked was (because I am new and expected to suck) I did not worked longer than 20 minutes on each figure.
Even when it sucked I moved on to the next to keep going and learn a bit faster. That way I did all of these in a couple of hours and noticed improvement right away. That's also the reason I dropped the outline cause I felt it was limiting my room for showing detail. The ones with the outlines were the first I did, then I did the other ones.

What do you mean with the ground line? Should it be a straight line, no detail ? Or do you mean the figures are not lined up evenly horizontally? Not sure what you are trying to explain