I think the mustache guy should be off to the right more, and maybe not giant, maybe just like a small stamper, the render in the middle is quite the tangle though, and the flower brush isn't elaborate enough for that tangle and it to combine, mono-schemed tags are often viewed as annoying and obnoxious, add a bit more color in there, you can do that whilst still maintaining the flower power look.
Good luck mate!
I forgot, the guns just plainly do not fit, maybe put a gun in the bottom right and have it shooting flowers or something of that sorts, but the way they are at the moment... just no, I'm new to this stuff myself, but doesn't mean I can't critique right?