If you want to lock images or objects in Google Slides, you can Group them, use Master Slide feature or use the photo as a Background.

On your Google Slides presentation, locate the slide that you want to hide, right-click the slide, then select Skip Slide from the context menu. Now the slide is hidden. You will see a cross-out ...

How to hide a slide in Google Slides Once you visit Google Slides, sign in, and open your slideshow, you can hide a slide using the Skip slide feature. Plus, you can do it in any view.

This article explains how to link to another slide from within a Google Slides presentation. Instructions for both the desktop website and the mobile app are included.