Good seeing new work from yah man. I totally miss seeing your traditional stuff like this, especially your gray paper stuff :(
Your detail work is amazing man. You really get down into some intricate stuff I cant handle, just soo damn tedious but it gives your stuff so much flare.
Only thing that I'd suggest is working more on pushing overall forms to pop more, having your details compliment them more rather than drowning them out. Just push some more contrast in the shading, some core shadow action, cast shadows, and when you're shading, shade the bigger forms first and most and tiny complimentary details second and a bit softer.
Hope that helps man, good work, and show us some guitar and drumming action.