I fully agree. Learning enough of the basics of photography to avoid the very worst mistakes isn't too difficult. It would take spending a few nights studying theory and just a lot of trial and error as one goes along. Paying attention is key. The typical non-photographer could up the level of their photos quite rapidly if they paid attention at all.

Your photos are actually pretty good and the content is simple but effective. If I may suggest, you could improve it in small ways within the parameters you've chosen (no face, no voices). For example, you might want to consider shooting creampies when you're done if that's ok with your partners.