Hang on, all this artist's other stuff is tagged under 'Sion' but 'Shion' is the correct kana from my shitty moonrune knowledge. What's the correct tag then?
Second the comment above. If the files are correctly ripped, its size should ba nearly the same as the size info on DLSite page. Simply doing screenshots will get the image quality down.
"Shion" and "Sion" are cognates of each other, reflecting two different variations of preferred transliteration of the same characters to English. The "sh" spelling tends to be more common and I think is the accepted one these days, but neither is actually more correct than the other.
(You also see this with tzu vs dzu, ou vs oh, and a number of other similar forms.)
I use DLSiteDumperGUI to extract. This is best resolution i can get. If someone could give me link for better tool or give advice how extract dlsite file i will upload in better quality.
@Planokur Thanks for the info. The tool you are using should be correct, then it might be the format issue, please configure your image converter to use 100 JPEG quality (and if there's other config that may degrade the quality, avoid them). I bought 1 copy myself and just tested that, mine is giving the nearly the same file size
Updated: I have not used that GUI tool and not sure if the JPG conversion paramter is configurable, if not please consider using the original DLSiteDumper