Front view looks great, on the side view there is like an absence of a nose in my opinion. Hence why it looks somewhat skeletal / voldemort ish to me. Maybe It's just that I still remember the otter from my recent visit to the zoo (pic related)
Took another look at your sketch - nose or not, I think this kinda skeletal profile looks right for the purpose of being a menacing mecha, so my opinion is that no tweaks are needed.
