Remove an image from top of another image
Hello! I have just started using Ai so I am sorry if this questions is trivial, but I couldn't find exactly what I needed so far. I have an image (it is like a circle with some gradient/shadowing color effect) and some other image on top. I want to remove the image on top of the circle in a way that the empty spot left by removing it looks natural i.e. the gradient of the circle appears naturaly. If the circle had only one color, I could have just filled the space by hand but in this case I can't really do it. How can I achieve this? Thank you!