[mehul-jogi]

Magento 2.3.4 provide to setup water mark for each image type.

Here are image types:

• Base – Display image using mouse hover
• Thumbnail – Display list under base image on product page
• Small – Display on category page

Make sure you have followed all the steps provided by Magento doc
https://docs.magento.com/user-guide/catalog/product-image-watermarks.html

I don’t think so you need setup upgrade command and static content deploy. You just need to clean cache only.

I have followed same instruction and here is result.

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