Bowser looks cool at 4X, but quite bad at 1X, I think. Just not enough contrast between the skin and the white of the eyes at 1X. Otherwise, this is great.
Love the Peach sprite; if only her crown bounced like Mario's hat. 
This Mario reminds me of something.... Dangerous Dave, anyone?
The face of the princess is hard to recognise. Great otherwise. I think Mario is my favourite...
Derpbowser! This is great!