you do not need a full polished mascot / character reference sheet to request art of your character!!!
however, the more visual references you can provide, the more efficiently i (and other artists) will be able to work with you :)
even doodles are perfectly acceptable, such as these:
i would highly recommend playing around in character creator apps like Picrew, no drawing skills required at all!
here is an example that i made :
(source)
there are ton of different styles all with different options for skin tone, accessories, colors, etc!
a more in-depth guide, if you want to get further into it →