I will design a creature for you

I can design a new creature for you. i just need to know the general vibe you want, if there's any symbolism to it and any other additional direction i must follow. I will give you a text file with the most detailed description i can come up with; i can also do a sketch, if you really want, but I'm not that good at drawing so it might suck. I have the tendency to lean towards dark fantasy and horror and the designs might be influenced by this, so if you don't like those two things i might not be the perfect guy for you. I also need to know i there's anything in particular you want to see in the design, of if there's any big no-no that i must absolutely avoid