@Visigoth: you're using too many polies for the chain rings. I would make all the links hexagonal with four sides on each division ((6*4 + 6*4 + 4*4)*2 = 128 tris for the chain instead of (6*2 + 4*6 + 6*6)*2 = 144 tris). It should look better an you get some polies for the other things. Usually going highpoly to lowpoly is…
@Visigoth: I think you could give the head a lot more detail, if you would change the handle into less poly's. It looks like you used 8 sides for it, I would only use 6 sides at max, maybe even just 4 for the middle, especially for the lod_1 version. Your concept looks really nice and clean, and I think there's too much…