I like the use of some animated, textured backgrounds! I assume you made some of that in Houdini?
My critique is about your face section. Your animation just quickly goes through a couple of non-poses, and then you wiggle controls like the chin and nose which doesn't show us very much information.
I'd suggest having an appealing face animation, and if you want to wiggle some controls, show some of the controls that animators will care about. For example, do your blinks look nice? Is the mouth flexible enough to hit the poses they need?
I agree that the reel is quite long. I don't mind longer reels (to a point). But it seems like you show that first muscle animation over and over and over again. The whole first 47 seconds could likely just be the quad view you show at 41 seconds, and a couple seconds of the rendered version.
As William Faulkner wrote, and Stephen King quoted about the editing process, "kill your darlings."