This would be a handy feature. I also struggle with finding many "wrong" images when I use Cover Art > Get From Internet, and also finding the track already has a "wrong" image. Possibly this is because of my taste in music
but the point is, MC could make it easier to fix poor/no images while working within Get From Internet dialog.
As OP says, one action when I can I find a better image it to then do separate steps to go back to the track and paste it in. Quite a bit of time would be saved by pasting it while in Get From Internet.
The other situation is when MC already has an image that is wrong, and no correct image is readily available. The immediate need is to get rid of the wrong/bad image, but not by selecting anything else at that time, because whatever MC is suggesting isn't right either, or no match has been found. (Common for me because at least half my tracks are not in albums or from very uncommon albums.)
Super helpful to handle this would be for Get From Internet dialog to have a Remove button along with the suggested images, essentially a buttom that tells MC "none of them, no image for this track, please".
I seem to have many wrong images, perhaps from earlier days when I let MC find cover art on its own (been using MC for 15 years). Currently, Get From Internet shows me the existing image of each track, but when it is wrong I have to make a note of that track, then later go find it and Remove its cover art image. It would so nice to just click a Remove button when MC shows me the image during Get From Internet. Please?