haha Guys, guys, I think he was kidding about the "us not liking him" thing. You know, he's being like "Hey, I go visit other forums, but don't worry... I still love you".
Anyway... I agree with Helm, in that I also think mixed resolution pieces rarely come out well. I did a small edit, which I think picks up on what Helm was trying to say about easing the transition:
Another thing that may be causing problems is the fact that your larger "pixels" aren't gridded in anyway I can figure out. On the back of the skull, for example, there are places where you are using 3-4x size pixels, yet have single pixel spaces between them at certain points. For me, this kind of breaks the "large pixel" thing, and gives off more of a "blob of colour" impression. I dunno..
Anyway, despite my distaste for mixed resolution, this does look pretty cool. Also, if you can manage to pull it off you'll be my hero, whatever that's worth, so... keep it up!