Review,
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1-For one, doesn't look like a skull or a firework, you need to look at some regular skulls and try to make this skull better.
2-Background lacks a lot, you need to make the fire blaze better it looks like its going from the middle towards the ends of the border.
3-Effects and details are in dying need, maybe add some fire sparks or smoke, something that makes it better.
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(All my recommendations to your icon, you can choose to use these or not, your choice.)
Thanks, Army-of-pandas.
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