Owlor 
If you are commissioning someone, don't be afraid to include some sort of visual reference, even if it's literally a stick figure drawing drawn on the back of a napkin or the digital equivalent thereof. Having any sort of visual reference helps a lot even if the finished art doesn't end up looking very much like it.
Sciasm 
@Owlor So much this! 🤩 Every time I did, the artists were super happy to receive it, as it helps reduce guesswork and accelerate their workflow.