"Smaller pose" = even less pixels, right ? So no, I don't think it'd help atm (again, this is my opinion, and I'm not an expert).
My take would be, for now at least, open a 50*50px canvas, and try redoing it from scratch, without being limited by a frame.
You asked for a more indepth critique, so right now, anatomically speaking :
- his whole silhouette is bent as if he were tripping and falling over
- his head is as big as his lower body
- his torso is almost nonexistent
- the arms are longer than the legs
This all sounds kinda harsh, but hey you asked ^^ and I'd really like you to try following a reference with a wider canvas.