Your 2d stuff is the stand-out success of your reel, also the biped run is quite good. The other posters have made some valid editing suggestions – its always tough when putting a reel together, you want to include everything you possibly can to flesh out a good body of work. You do have to be brutal though, rip out the stuff that is unfinished or doesn’t work. I’ve seen a lot of reels (have been an art lead for over 4 years) and I also suggest you leave out the head on a plate, it seems to be an unfinished character model dressed up a bit with a scene for inclusion in the reel.
Good luck with the reel, if I can be of any help to you (maybe offer advice on rigging, or help dicky up some of those models) then feel free to PM/email me.