Realistic pony model upscale test

Trying to realistic pony model : meichidarkponreal

base image (816 * 1024)

prompt : 

realistic portrait photography, full body, photo of a lady, solo focus, look at viewer, Chestnut hair, hair_over_one_eye, huge demon_horns on head, shiny skin,

Tan detailed shinny armor, patterned shoulder_armor, bikini, abs, flowing long tangled fabric, cape,

big breasts, narrow waist, thick thighs, tan pantyhose,

Leaning forward with hands on the hips ,

vibrant red and pink tulip fields of the Netherlands, creating a stunning display of colors during springtime, score_9, score_8_up

Negative prompt : 

fishnets, pregnant, monochrome, greyscale, text, signature, watermark, mutated, mask, glasses, eyewear, extra legs, extra arms, umbrella, sandals, censored, score_5, score_4, deformed, furry

upscale *2 , two times (3264 * 4096)

As you can see original size, there is some artificial pixelized.

Inpaint face, hair, horn, each shoulder armor, collar, breasts, stomach, panties, each thigh, calf, each foot, each hand, each fore arm. and add pantyhose

I think image quality is same as stable diffusion 1.5