You should try to start a new model, let old projects go. It will help refresh your skills even more than working on something old. Post some references you're using as well, I'm interested in seeing them.
for ellie the head seems too small and the legs are too long. the robot guy is awesome but parts like the torso and the part of the arm under the shoulder looks like rock not metal
Before doing any anthropomorphic/humanoid sculpts, I'd try to do some more human anatomy studies. Once you know human anatomy, things will come together more logically.
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Work in progress
WIP