Inventory Base allows your to customise your reports to the exact manner in which you prefer, including changing the size of your images on your final report.
Navigate to your Settings tab at the top of your online dashboard > click on Reports:
Scroll down to Photo Sizing and Layout:
You can choose if you want to have one, two, three or four images per row; as you select each one, the display on the left will change to demonstrate how the images will display on your final report.
Note: this can also be applied to specific inspection reports: navigate to the inspection on your dashboard > click on Settings for that inspection and follow the above steps.