I would love to but don't people usually use photoshop or Illustrator to create beautiful OTs? I don't own none of that, the best I can do is post pictures I find in google.
1. you dont need to make a beautiful OT
2. maybe Wunray does art/ has software
3. you can reach out to the community volunteers for help.
4. there are free alternative softwares to use.
5. you can even just use your computer default paint program to just type "neogaf OT" on a googled image of the game
6. OTs dont need custom graphics. trailers/media/information about series/game is waaaay more than enough. basic doesnt mean bad.
7. I believe in you (and wunray)