That's a valid suggestion. I pulled the images from Unsplash (free to use), and needless to say, there's not really an endless assortment of pictures there, so I did with what I found, sadly. It is definitely something to improve upon, maybe I will get someone to do the photography for some of the topics, or alternatively go for a design. In reality I am not exactly fond of the execution of the categories - in the end they're sort of a filter, so I could have simply created a "super-page" where you could have those interests listed as filters, and could have found users sharing more than 1 category. On top of that, currently the platform has a fixed amount of categories, and it does not allow users to add themselves to any other interest, which is a bit limiting and unfortunate. Because of that, in the future I might redo this section entirely, which could help fix the issue you raised at the same time.
Thanks for the feedback!