That’s the white coated, blonde maned, earth pony mare right? If there is no one else working on that, I could make it. I usually use screencaps of the show as base or reference if you don’t mind.
I’m willing to help with drawing for the OC collab, but I’m only taking on 1-2 from each social platform I’m on, and only as fairly simple, canonical pony species only. Though I’m always eager to help with character design.