Curious way to draw it, but let's dig better into this:
On the tecnique used, I think that everything looks fine, more than average for sure. The color's are very well balanced even tho the blue of Armstrong (I used this as a placeholder name for him/her) seems conflicting with the rest of the colors (but really slightly) even tho I guess it was a way to underline better the character in the drawing, in this case is fine.
Another thing is are some drums, which look abit too sketched (the first three), I mean they don't look geometrically correct.
On the crativity used, I gotta say that the design of Armstrong is low average. The high number of eyes looks random to me and abit mediocre alongside the fact that is supposed to be a drummer. Nothing special if you ask me, except that weird but interesting crest of hair that he/she has.
In the end I think that is an "ok" drawing, very simple in style and colour.
The only thing particular is the way you coloured it, with acrylics, something uncommon here.
Hope the review didn't bother you, and if you want more informations, or want to correct me, please do not esistate and write me a private message.