https://help.steampowered.com/en/faqs/view/0688-7692-4D5A-1935
This is a document about character design, I think it will be useful to read!
This is a guide on how to use color and the direction to focus on when designing characters in Dota 2.
I think it will be useful for those who design creative characters!
In addition, you can check various guides for character textures and items :)