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konpaku_youmu sankuro sword touhou

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What's that background 'artifacting' about? If it's deliberate, I find it distracting.
If you're talking about the white glob - that's Myon, Youmu's (the female character) ghost-half (she's half-human, half-ghost).
If you're talking about the straight black lines - they're Youmu's sheath and the sheath's strap.
There is what seems to be a rectangle of vertical lines in the background and in her dress colour. If it was a scan I'd say it's some kind of fucky bleedthrough but I suppose it's digital off pixiv...
It's not just the bg, its the whole area, as if a watermark.
Bleed though wouldn't be so consistent.