I can visualize specific, static picture like stock photos, but I cannot manipulate them.

eg. "picture a venn diagram" - I can imagine the basic one with A, B and C overlapping a bit. I cannot adjust how many items are there or how they overlap or what colour they are.

"imagine a beach" - standard photo of a beach you see in travel ads. Usually include text like "discover Greece!"

"picture a cat" - the most common photo of grumpy cat, I can also switch to keyboard cat, poptart cat, Garfield, Felix the cat, but I can't picture a "regular" cat despite having owned one for over a decade

I wonder if that counts as aphantasia or just severe lack of imagination. Since I'm not "blind in my mind" - I've a large internal database of pictures, but I can't do the "picture yourself on a beach" thing either.