Sokka from ATLA. Trained exclusively with actual screenshots from the show, without any fanart, so you will get closer to the original images. I've tried to include every possible hairstyle and clothing he had through the show, some trained better, some less, but overall I think it's good.
If you want to get closer to the original looks then try to add:
"anime screencap, official art, official style"
But be informed that it will cost you with slightly lower resolution. It's already close to the original without any additional tags.

Here are some styles for him:

1. Water tribe Sokka, this is how we see him first
Sokka, brown hair, topknot, undercut, blue eyes, water tribe clothing, blue clothing, fur, gloves,

2. Regular outfit, this is how we see him for most of the show
Sokka, brown hair, topknot, undercut, blue eyes, water nation clothing, blue clothing, neckwear, sleeveless/bandages,

3. Messy, this is how we see him whenever he takes a swim or sleeps
Sokka, brown hair, loose hair, blue eyes, messy hair,

4. Fire nation armor. When they took control of the fire nation ship
Sokka, brown hair, topknot, blue eyes, fire nation armor, cloak

5. Fire nation citizen. The stolen clothes from fire nation
Sokka, brown hair, topknot, blue eyes, fire nation clothing, sleeveless, sandals, gauntlet, bird, red bird, pet, bird on shoulder

6. Hanfu Sokka. When he found a teacher and welded his own sword
Sokka, brown hair, topknot, blue eyes, hanfu, black and gold hanfu,

7. Training armor. This is the armor he used while training swordsmanship
Sokka, brown hair, topknot, blue eyes, open armor, black and gold armor, harness, helmet, open torso,

8. Water tribe armor. The armor he wore when he fought against the fire nation army
Sokka, blue eyes, water tribe armor, blue armor, sleeveless, wolf helmet, gray helmet,

8. Prison guard. When he tried to escape with his father from the fire nation prison
Sokka, prison guard armor, prison guard helmet, sleeveless, eyes covered, no eyes/blue eyes,