How to make the yourself skins good:

Limitless customization. Custom theme, from any skin you own on any killer.

The ability to toggle the killers unique features (example, noli's decay and face.)

Custom LMS.

You could either choose one from the game or get a sound id that matches LMS time or you could shorten it yourself in-game.

Custom intro, choosing from any killer and any killer skin.

Custom sfx.

You could only choose from other killers and skins though.