I personally find it too hard to make a good-looking show-accurate OC when basing it off a real person (like myself) so I opt for ponifying a personality or gimmick instead. So basically, don't make an OC of yourself, make a pony that would be interested in one or two things you're into, then imagine how a pony like that would dress up, or what colors match that feeling/aesthetic, and it might come out better.