Should users have to press enter when using a search filter?

I'm working on a photo app that lets a user search through their photos. It currently has these filter types - category, date range, and favorites. A user can pick one or all of these filter types.

Should a user have to press enter when using the filter?

Currently, the search box itself has a Search button (we are not looking to changing this for now). Will this create inconsistencies if we were to eliminate the Add filter button? - ie: The search box has Search button, but filter will auto-populate results?