So, sprite comics have finally come to the Gym. Time for some crit.
First, get some better humor. This stuff is gross.
Next, change the color of the grass to a darker color. MS Paint green is not grass green. It's more like nuclear waste green.
Your speech bubble are ok I guess. Normally I would say have some kind of arrow to show whose talking but since Mario is the only one who talks I guess it's ok.
Not a bad start but it needs improvement if you want it to be great.