Do you mean the rule about gore (18+) etc.? Your art won't be a problem even though it's "mature content". The rule is about decapitation and sexual arts etc. Your art contains blood but it's not like you can see the bones broken or rotten or burned.
The rule shouldn't be interpreted in a black-white way (yes or no) you can rather say it "depends".
Tldr: your art would be fine and I thank you for asking before posting.
really? I honestly didn't know that o3o I knew that u could withdraw if it weren't accepted yet. Eh.. I probably knew and just didn't pay attention. Nevertheless thank you!