Unlike the other images, I have absolutely no clue who the artist for this one is- the sketch style means that it could be absolutely anyone who made new game art for DDLC+ (so probably squchan or lucidsky, but possibly also one of the other concept artists- almost certainly not satchely though), but I can't be certain of it being squchan or lucidsky since the credits leave it ambiguous (this wouldn't be under the "CG" credits, it would be under the "additional gallery art" credits, and there's a LOT of people in there). Hell, unlike most of the other concept art images, this one doesn't have the artist name in the filename- something which I'm suspecting was done deliberately, even, since this is supposed to be an image that was delivered to you in-universe.