I would not characterize that small summer breeze image as "going off the rails" or "uncool." When it comes to that picture, I don't think you need to worry about anything so serious.
In my opinion, it doesn't add much to the post. But it doesn't really take anything away, either. It's small, reasonably unobtrusive, and arguably has the benefit of making the post more enjoyable. Or someone might consider it tedious or tangential. And maybe it effectively highlights the point about how installing 32-bit packages on a 64-bit system is the easier situation. Or maybe it distracts from it. Or maybe it makes no difference.
Personally, I probably wouldn't have included such an image. I'd probably edit it out of my own post if someone else put it there. I strongly doubt I'd edit it out of anyone else's. And other people might really like it. I think if you feel your answer is subjectively better with the image in it, you should go ahead and keep it.
This answer on Super User is widely liked. I upvoted it, though not for the images. While the pictures there are more strongly tied in to the answer's core message thematically, I think they're only slightly more relevant or useful than your summer breeze image. (The pictures there may even have the detrimental effect of conveying the message that Ubuntu users have to be more careful not to get hurt than Windows users, which is not true at all.)
So: I think your screenshot is not a problem or a violation of our community norms or anything bad like that. But maybe you should remove it. If you're just worried because it's somewhat unusual, I'd suggest keeping it. But if on reflection you think the post isn't any better off with it, I'd suggest removing it.