I missed that you said you "cant' see many JPEG arifacts" so do you see it and wouldn't that be consider a problem here, like I said admit it's not a lot but it has then.

I already know about the preview concern the quality I don't judge the preview (because it's a preview).
This has artifacts, I'll admit not a lot but it still has them.
And you consider this high quality to upload https://anime-pictures.net/pictures/get_image/411776-1333x800-fate+%28series%29-fatestay+night-tsukihime-type-moon-toosaka+rin-toono+akiha.jpg if you say that's good quality I really don't understand what this site wants then. Nearly the recent uploads from the artist the quality have been lost either purposely or not internally.
If this is accepted here I don't understand how this wouldn't https://anime-pictures.net/pictures/get_image/418416-1447x2039-kantai+collection-shimakaze+destroyer-rensouhou-chan-hojo+daisuke+%28pn%29-long+hair-single.jpg

No, it's not.
Sign never mind then.

All those artifacts around saber that's why I didn't upload it and I have a picture with good quality in it but it got deleted because it's poor quality.
So far no anime image board i'm in is accurate enough.

So low quality images like this is accepted here?