amane cleavage dream_c_club futaba_riho ili jpeg_artifacts megane mio_(dream_c_club) nao_(dream_c_club) rui sayori setsu thighhighs waitress wallpaper

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I'm curious to ask why did the artist save this picture in such, for the lack of a better term, JPEG artifact-ness way. It slightly ruins the picture as a whole in terms of quality. Maybe the artist isn't aware of this and needs to be told of this.
it looks re-compressed jpeg.
a worker of that company might make this from jpegged one and others couldn't noticed?
or someone trolled :p
I sent a message to the company (・ω・)ノ
So...any word from the company yet? Have they fixed the problem yet?