I'm not just going to spoon feed you. I'm going to teach you to fish so you never go hungry again.
First look at this:
See this triangle? Click it. It'll open a menu.
With posts that do not have an image posted with them, you'll just see the "report post" ,"Hide post", and "filter selected text" options. If the post in question has an image attached, you'll see the "image search" option.
When you mouse over that one, you'll be able to select which image search engine you want to use. Google is useless 99% of the time it's an image that's NSFW so you'll want to click, "iqdb."
In this case, iqdb came up empty as well. So when you're on the iqdb page, you'll see, "Maybe try this search on..." and iqdb will give you three recommendations. Tineye SOMETIMES works when the other two have failed, and the first one is google image search which came up empty.
So click "saucenao."
Boom. Sauce found:https://www.pixiv.net/member_illust.php?mode=medium&illust_id=71635935
Artist is "Milky Way."
IF you're on mobile, you may not be able to use this option. Which means you'll have to download the image and manually go to iqdb/saucenao and upload it into the search manually that way.