Optimisation-wise, I woulda split the goggles off and just intersected the meshes instead of extruding them from the hat. Same deal with the backpack. I also doubt you really need the extra edges coinciding with the stitches along the side of the cap. The visor probably doesn't actually need any thickness. As for the hands, I'd suggest either putting the edges running vertically down from the thumb to better use defining shape/silhouette, or get rid of them completely (lengthen the pink edges, or merge them completely).
You'll want an extra loop around the upper arm to help with shoulder deformation, btw.
Aesthetically, I think it's cool, but I find myself preferring the proportions of the concept, especially with regards to the cap.
Blue edges can be merged/collapsed, red edges can be deleted (split the goggles off, possibly the backpack), green edges to be added