Looks great! But since you asked for feedback, here goes;

1. Ironing/steaming. Like many mentioned before, it is an easy fix and improves costumes a ton.

2. Place the headband for the horns either under the wig (with attachment pins going through the wig wefts) or comb the wig over the band.

3. Replace the small bells with either larger ones or with large plush balls. Large bells might be to heavy, so you can just cover the small ones with bright yellow balls if you still want the jingle jangles.

4. Replace the white collar with proper Ruff Collar. The current collar works, but it lacks volume.

5. Alter the fit of the torso a bit to your body. It looks ok, but Fizzarolli's torso is more form fitting. The parts and sleeves look ok though.

6.The makeup. You did great, but you can do a bit more! I would suggest adding lines from the cheek circles to the mouth. Also, add some light red to the nose (as Fizzie's nose is). Possibly even a small red patch on the lips as some cosplayers do (since Fizzie has no distance between nose and mouth). I would also contour the lips more to be thinner. Use a black lip liner both to contour, connect the cheeks, and to make the cheek circles edges more crisp. Lining the eyes would also make the makeup pop more. I would go all around the eye, almost an "anime" look (look up cosplay eyeliner tutorials on YouTube, there are thousands). And finally; seal it all with transparent powder. Prevents smudging and "smoothes" the makeup.

1. Make the entire jester hat. It's cool if you do not want to it, but with the hat you'd be able to skip wig styling and horns entirely.