Bigger images in print-layout

Is there a way to make the images in the upper right corner bigger? My aim would be to have larger thumbnails, with the title below each image. At the moment the images are decidedly too small and printing them, it is not clear what image it is. Each image belongs to a different record, linked to the others by the customer's name.

I've tried everything and can't believe there's no way to do this

Thanks to everyone