WP Smush Pro + Whatermarkt + Gallery

I have about 2500 products in WooCommerce and have applied SmushPro, great! I have improved the performance of the web.
Now, I want to put all watermarked images. I don't see plugin for that in wpmudev. I suggest some method or plugin. Thank you.

And finally, some products have a gallery of images, but very few. I installed a plugin Gallery (Lightbox Gallery) in general, or is there some method to be charged only for products with gallery ?
Or, is there any light gallery plugin?

Thank you very much,
Sorry, my English is terrible.