I’m working right now with the Image Checkbox and Image Radio elements and I noticed some things:
Options in Image Checkbox are not rendered correctly.
If I enter a label it will not show under the image.
Probably no bug, but it is always neccessary to select a image in the Checked style tab. Otherwise no image is visible as an option. Here it would be nice to have the same styling options as in the card elements.
No error message after submit as in other form fields (same for the Cards element), like this: