If you something is "art" then it almost by definition will "say something" if only the expression of an artist and their intention.

If you are talking about the background colour of a slide, that is not "art", it's a simple choice.

The portrait for your d&d character - if you used AI to generate just because you need any image and you don't care, you need a representation, then it may be difficult to classify that as "art". If you drew it, regardless of how bad it is, and you like and appreciate and connect with it, that is "art".

Of course, we may all have our own definitions of "art"