Check out the new denoising checkbox under the scene tab. It will get rid of all of the fireflies. The lighting needs improvement too, you an make light source shapes invisible but still emit light, to do this you must click on the emitter object and under the Orange box tab in properties window uncheck the box that says camera under the cycles settings.
Also test using colored light, when it's a sunny day outdoors make the light yellow when cloudy make the light gray etc.
I love character's design but less frames should make the movement more natural. I hope this helped, keep at it you've got potential.