As a massive fan of the v1 reapers and a lover of the look of the v2 I'm going to put in my two cents instead of just posting that your work is amazing as always.
I think for me the coolest part of the v1's design, is the expression on its face and the composition of the jaw. It looks both menacing and mad at the same time, neither shouting nor pouting. Having a skull without the lower jaw removes this, but I think a similar effect could be made with work around the shape of the eyes.
Another thing that really makes the v1 great, is its shape and size. The v1 is pretty short, shorter than most cherry keys and has a really nice feel to it and works great on a board. The one consern I have with the v2 is its height, which has been carried over in this prototype thing. IMO the Reaper should be pretty short and round.
That said the quality of work is amazing, just figured some feedback from someone who likes your work might be useful!
I'm really glad your working on this as its a classic theme! Can't wait to see what else you got cooked up