I agree with EyeSeeCold. Very bold! I really like your textured backgrounds, too.
I quite like the one with the megaphone. It's so simple, but at the same time I can't stop looking at it... It sort of pops out at you. It's the colours, I think.
This is one of those cases where you can see someone is really good at drawing and aesthetics in general, but is also a master at keeping it simple. Without making everything look like a children's drawing. I've been aiming for that "feel" in my art as well lately.