I don't think it needs more sticky-outty-bits. The thing that makes it look non-organic (to me) is the rounded-metal shoulder pieces.
I don't have a strong opinion about how it _should_ look. (Actually, I kind of prefer the first version with the shorter spikes.) ; but I could suggest that having a ridge in the centre of the shoulder pieces would make it look less machine-made. Like /\ shape instead of ∩.