Japanese title: ガールズ＆パンツァー もっとらぶらぶ作戦です！ WEB出張版
Artist: Nii Maruko (aka. Nanashiro Gorou)
Side story 4komas of the official Girls und Panzer manga series "GIRLS und PANZER - Operation: More Love Love!" as hosted on the official site.
The last unofficial step would be to compare the saved image with prior images to visually check that the margins are correct. Irfanview can be used for this, opening the image in full-screen and going back and forth between the saved image and the previous image (space/backspace in Irfanview).