RushCars24ID 
I wasn't expect on this one, cute style too, although I'm originally expecting to be the full Shadow Five on this but you went picking just two members you loved the most, then the rest follows up later. It's fine, I'm only here for Sugarcoat tho.
[@Swasfews](/images/3167427#comment_10613855)
Sugarcoat's actual cutie mark is this single firework (or is that a dynamite?):
>>945385t
Alternatively but optional, character's design, including sometimes their cutie marks, can be altered/changed for use only in fan alternative universes (AUs), few older work examples by other artists with altered cutie marks, can be like [this](/images/1332678) or [this (there's a comment post to confirm that)](/images/1743192). May not necessary for you to take that route but you can give that a try, as long it's not like those where artists didn't look at the given official one before drawing such as [this unknown example](/images/1043391) or [this from 2018 (date according to DeviantArt)](/images/1739739).
[@Swasfews](/images/3167427#comment_10613855)
Sugarcoat's actual cutie mark is this single firework (or is that a dynamite?):
>>945385t
Alternatively but optional, character's design, including sometimes their cutie marks, can be altered/changed for use only in fan alternative universes (AUs), few older work examples by other artists with altered cutie marks, can be like [this](/images/1332678) or [this (there's a comment post to confirm that)](/images/1743192). May not necessary for you to take that route but you can give that a try, as long it's not like those where artists didn't look at the given official one before drawing such as [this unknown example](/images/1043391) or [this from 2018 (date according to DeviantArt)](/images/1739739).