For correct anatomy according to the movie, use:

• m-melvin, grey skin, gnome, 1boy, solo,

Negative prompt: greyscale,

To be more precise use: black hair, gray eyes,

Clothing:

• grey shirt, grey shorts, footwear,

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, greyscale, text, watermark, 1girl, woman, pussy, female, female clothes, panties, pectorals, obese, muscular, thighs, bara, slim, simple background, expressionless, squat, fangs, big penis, collared shirt, chibi, shota, child, freckles, painted lips, mutilation, green eyes, blue eyes, clothes, thick eyebrows, earrings, tits, size difference

Note:

• It is necessary to use gnome in order to keep its anatomy

• Without "grey skin" has a normal skin color

• Without "greyscale" only one color is maintained

• Without "grey eyes" eye color is varied