Hi, Russ. You did a really great job on this illustration. The character is very fun.
I did a subtle paintover to show some areas I think could be improved ever so slightly.
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I thought that the staff might look fun with a bend in it, because the rest of the shapes are so curvy and fun.
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I thought the facial hair was a little too contrasted, so I softened it a bit.
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The shadows in the face were quite dark, but you weren't pushing them as much in other places, so I darkened the undersides of things like his arms, football, wrinkles in the hat, the scroll, etc, so they would match the value system of the face better.
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Added some highlights to the grasshopper.
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I shortened the nose, not because I was bothered by the size, but rather to make a gap between his nose and mustache. I thought it would make the silhouette stronger.