Nice renders, u're getting good. What software are you using for your gens ? What i do is to always upscale my image after. Since i use comfyui i can use kritai with comfyui plugin. But even if u don't use comfyui, u can upscale after, and it is something easier. I made u 2 samples. A came out freshly from comfyui and B had refine/upscales on krita. Do not take care about the fact that i corrected some details such as face/hands. Just look at the resolution which didn't impact the quality, even improved it "somehow"
A ;
View attachment 5561994
B ;
View attachment 5561999
upscaler used was remacri original, u can find it on civitai