Take away the bright outline. Flatten the bottom of the pumpkin a bit, a circular bottom doesn't b ode well for stability. Maybe add a stalk nub on the top or if it's open aired, show some light pouring out? I'd suggest upping the contrast a bit and making the glow coming from its various orifices more apparent.
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3 things Id sugest to add to it.
1: Add shading
2: Make it Look more like an actual Pumpkin
3: Arent Pumpin's orange? Oh, And change the outline.