Welcome @Samantha_Garza1
The ImageCircles components takes a coloured mesh as input and creates circles affected by the local colour of the mesh. So it’s more for when you want a gradient of radii, or radii following a picture. In your file the mesh is not coloured, so it isn’t changing the sizes.
To have a rectangle filled with random circle sizes randomly distributed instead you can do it like this:
randomradiipacking.gh (9.8 KB)