When you want an image to use for your character portrait, you have two choices:
- Spend years mastering the art of sci-fi / fantasy illustration. Perhaps attend art school. Hone your craft until you can fully realize your character on paper just as you imagine them.
- Use Google Image Search and swipe something that looks roughly like how you want your character to look.
For whatever reason, most players take the lazy way and opt for #2, despite the fact that there is a 90% chance they are going to look like a brooding androgynous goth / punk elf holding the wrong weapon.