Decent
Ok well this seems like something you did to practice with and nothing really you were working on. I get a feeling this was a character design concept. I don't find them to all be bad, but they are definitely works in progress. I think the skull thing in the bottom corner is your best one and you have certainly improved from this since then. I hope you add more red to it in the future and maybe draw it more like blood, as this comes off more like red pain on the skull. The others are okay, but nothing spectacular. I don't mean they are bad, but nothing I can add in terms of improvement. I do think the robot's arms a bit too long. I think each of these should have their own separate submission and try to have them each have a background to really enhance the art.
~~THINGS TO IMPROVE ON~~
Needs improvement in all the characters, I would not submit them together and do something for each one, but good job overall on your earlier attempts.
~X~