It looks very nice especially the fall animation. I like the colors and AA, but I think you should change the fist shape from a circle to a different shape that more mirrors an actual hand.
This may turn out bad... Everyone will want to be a tutor because everyone thinks that their pixels are great, and may turn to a lot of difference of opinions.
Yeah, I agree, there's no real hip or joint areas. The legs are stuck to the bottom of his torso. Other than that I think that it looks nice, but maybe not use such a simple dithering method.
You should give them some muscles it looks like squares were put together and hinged for their legs and there bodies are just blocks, and should add some texture to the grass. Other than the anatomy its a nice looking signature epsecially since you got all you're friends in it.
I haven't pixeled for a while and this was a real quick one after watching the Fantastic 4 trailer. I don't think it really captures his real nature and his right leg (our left) think needs some work. It was fun to do and I might do more, but I'm not sure. New one:
Here's some tips:Not sure why I'm trying -blend the render -make a less monotone background -make render larger -make render clearer -better text would help too.
I think that the pattern of dithering you showed is very novice and could be further built upon. Otherwise, that is a great tut for starters, good job.