For correct anatomy according to the series, use:
tdowen, 1boy,
solo,
To be more precise use: solid circle eyes,
Clothing:
white t-shirt, green shorts, green shoes,
orange shorts,
topless, tan
For score:
I recommend you to have a look at the reference images,
prompt: score_9, score_8_up, score_7_up, score_6_up, score_5_up, score_4_up,
negative prompt: low quality, worst quality, simple background, white background, bara, muscular, pectorals, patreon username, text, watermark, earrings, 1girl, woman, pussy, female, nipples, navel, bad eyes, facial hair, body hair, worst_teeth, slim, thighs, greyscale, mutilation, freckles,
thighs, greyscale, monochrome, mutilation, aged up, adult, (slim:1), (shota:1),
Note:
For the total dramarama version you can use "child"
The “leaf” symbol can be distorted at times
“tan” is to show the mark when owen is shirtless, if you don't want it you can put it as a negative prompt