How to model or design textures easily without buying a program?

Like for example, I want to replicate an anime character head or make anime skin as an armor, and icons for abilities? I'm kindof making a game similar to anime battle arena, where you can fight other players using anime themed kits! I'm pretty sure I got the abilities accurate, I just need to know how to have items that actually look like the one on the anime. For Sung Jinwoo's igris summon I'm literally using a wither skeleton skull😭 someone pls help. Also custom playsounds and particles if possible