Under collection settings, where you can add fields for each project, it'd be great to be able to add a repeater field. This would function like Advanced Custom Fields in Wordpress, so that in the CMS settings you could add an image repeater field. Then, in the user side of the CMS, you could add an image and have a button for 'add another image'.
ACF Repeater field: https://www.advancedcustomfields.com/resources/repeater/
CraftCMS Matrix field: https://craftcms.com/features/matrix
I've run into this issue trying to use the CMS for a portfolio and hitting a 31 field limit.