I think the main problem with the side view you did is anatomical. In the side view the little guy is standing stiff as a plastic doll. Plus, there's not enough volume on his chest and belly. Check out my quick edit:

I've simply added volume (guts, bones) and bent his limbs a little so he'd look more relaxed.
Side views are tricky. I usually Google some reference poses when necessity arises, even if my character is cartoony.
Cheers,
-Stefano