There are some multiple picture viewing options built in the macOS that you might find useful:
View Pictures
QuickLook : Use QuickLook to view pics. Just select a pic and press the space bar. Then use the up & down arrows to move through the folder. You can get a grid-style going from QuickLook by clicking on the little grid icon in the upper left of the photo when you’ve opened it via the Spacebar key. You’ll get a grid of all the photos you selected before you went into QuickLook.
Or
Preview: You can select all the files in the folder (Command-A), then right-click and Open with: Preview. That will open all pics in Preview so you can navigate through them and edit them, if you choose.
Or
Slideshow: Grab yourself a folder full of photos that you have on your Mac, and open it up. Then, select all the files in that folder or use Command-A. Once you’ve got them all selected, hit Option-Command-Y on your keyboard to start the Slideshow feature. Once you get the slideshow rolling, click on the little grid icon at the bottom of your image, between the right arrow and the Share icon. All the photos you selected will now show up in a grid, ready for your perusal. You can use the arrow keys to move around in the grid. The grid will rotate to any photos that don’t fit on the one screen when you get to the lower right corner of the photo layout.
Or
Column View: Set your Finder window in column view, then you can step through all the photos/images/documents in a folder and also navigate in and out of nested folders using the cursor keys.