Answer:
Saving all graphics as JPEG files
Step-by-step explanation:
A JPEG file can be defined as the way in which images ,graphics or photos are been stored after the compression of the images has occured because compression of images help to reduce the quality of the image thereby creating more available space.
Since Santo file size has become unmanageable with so many sketches and photos the best alternative for him is to Save all the graphics as JPEG files which will enable him to have extra space because JPEG files will enable the compression of those images by reducing the quality of the image without leaving out any content.