Unless you bind a suitable control to a table field that contains an image, you cannot. On a continuous or datasheet form there is really only one of any control. The repeats are 'instances' of that control and if unbound, what you do to one affects the other. The only exception is conditional formatting, but you are limited with what you can do. I think there is a workaround but I have never bothered with it. You can substitute wing ding fonts for images, which I've seen done in combo lists so I think it is possible in a continuous form as well.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.