quite an eclectic mix of styles and subjects, for the most part they are rather good, the gangsta bob the builder one looks quite odd especially the way the parrot is standing, I can see he is standing on one foot and gesturing but the foot he is standing on seems not to be very well placed, and the pustules or whatnot on that rainbow puking fatty are quite bizarre and read strangely but I guess if they are meant to be grotesque then it works,
I think the rendering is nice, but the glass is a bit dull and here's a quick edit of what I'd suggest to further push the glass effect
also attempted a quick edit on him too, as compared to the rest of your pieces it seemed the only with some glaring issues, the curve on the hat was really jagged, his right arm elbow was protruding quite alot, and as before stated the parrot seemed badly placed, the ear wasn't a great point of focus so I think some overlap would be welcome, you imply some more dimension by implying some Z depth, also I can't read whether it's simplistic eyes or closed eyes, but I think with little effort you could further emphasis the attitude you already have going in the body language/posture, and the cyan was a bit too pure and bright for my liking, and I thought it contrasted too much, but maybe that's just me. also you established some high contrast then the shades used on the bird are quite low in contrast
good stuff, I like the pattern you've worked into the skull
