I think the gorilla half of the picture is perfect- as you can see by the attached picture I've had some experience in this genre- I liked this back shot because it captured the "gorilla-ness" of the animal-person, huge strength but a contemplative nature.... yours really does the same, the lighting couldn't be better.... as for the blurs in the glass, (I guess it's glass) I think as you look at enough photography you loose interest in double-exposure, "tricky" stuff, accidental or not, it's just a distraction..... I wouldn't crop it, just know that the gorilla is carrying the weight..
By the way I took this with a borrowed Hassleblad during a one day Hassy workshop with a Boston Zoo assignment for the group. All I can say is that is one awesome camera....
