Or as the rest of the world would say:- "It looks a bit like this."Polina, welcome to the forum.
Regardless of Biffo's (justified) comments on your pictures, I think there is a different problem here. You seem to think there is "academic English" and "plain English". This is a mistake. Increasingly, modern academics use plain English, and if they don't they are mistaken and misunderstood.
The correct way to say in academic English “It looks something/approximately like this” is simply: “It looks something/approximately like this”.
I think the more formal phrase you are looking for is "It bears a [marked] resemblance to <insert reference>."When you are describing something referring to the picture, how to say in academic (textbook) English “It looks something/approximately like this”?