From the command line 

$ find ~ -name '*.JPG' -mtime -7 -size +2M
/home/grant/Desktop/DSC01801.JPG
/home/grant/Desktop/DSC01804.JPG
/home/grant/Desktop/DSC01805.JPG
/home/grant/Desktop/DSC02008.JPG
/home/grant/Desktop/DSC01802.JPG
/home/grant/Desktop/DSC01800.JPG
/home/grant/Desktop/DSC02009.JPG
$