If you are going to request an OC, I would be pleased if you send a reference picture for the pose, so not only I will benefit from the knowlodge of the show's drawing style and proportions, you will also have exactly what you want, since you choose the pose. ._. win-win situation, right?
Also, don't forget to expain every detail
:bulletpink: Type (unicorns, pegasi, earth ponies)
:bulletblue: Race (normal ponies, crystal ponies, thestral, etc)
:bulletgreen: Coat and Mane colors
:bulletpink: Body type (fat, thin, normal, alicorn, etc)
:bulletblue: Manestyle (spiky, long, short, curly, etc)
:bulletgreen: Personality and/or aditio