These kind of abstract things are pointless tests - when do you need a stained glass picture of a woman in a library with a raven on her shoulder with a key in

These kind of abstract things are pointless tests - when do you need a stained glass picture of a woman in a library with a raven on her shoulder with a key in its mouth ? You're likely to accept some wildly inaccurate things in those images because the subject is so abstract. A more practical use case is "bicycle, branded x, with y frame shape, with an adult male, 40-50, riding down hill in mountain road in spring" - now that's something I can use as stock photo. This example is very specific - but insert whatever product you want in whatever scenario you need it. Here it becomes important that you understand features of the objects you're drawing to avoid making colossal mistakes, and you're going to notice if the model doesn't understand it right away. Painting abstract portraits and random art is fun but you're willing to accept so much as correct that it's not a very useful measure of model quality (personally).