For such results you should start from simple prompt, like:

safe, ((derpiboorup95)), oil painting, fluff, solo, (nightmare moon:1.05), full body, evil smile, moonlight, night

And when you will be satisfied with general composition, start adding detail with img2img. Prompts be like:

safe, ((derpiboorup95)), oil painting, fluff, solo, (nightmare moon:1.05), full body, evil smile, detailed hair, detailed fur, moonlight, night, cinematic lighting, soft shadows, artstation, digital illustration, detailed, sharp, smooth, vibrant colors, smooth gradients, depth of field, lora:add_detail:0.2

And final step will be inpaint on face, cos get a good face on full body picture almost impossible:

safe, ((derpiboorup95)), oil painting, fluff, solo, (nightmare moon:1.05), full body, evil smile, detailed hair, detailed fur, (detailed face, detailed purple eyes, detailed eyelashes, extra long eyelashes, black eyeshadows, extra thick eyelashes), moonlight, night, cinematic lighting, soft shadows, artstation, digital illustration, detailed, sharp, smooth, vibrant colors, smooth gradients, depth of field, lora:add_detail:0.2

Neg promts was:
(derpibooruplow), (e621plow), ((anthro)), ((((bad limbs)))), ((deformed)), (empty eyes), 3d, ((cropped)), extra legs, blurry, ((ugly)), bad proportions, glitch, watermark, signature, ugly, poor quality, deformed, (distorted:0.9)