Better late than never.
Sounds like you have already put some time and effort into this, but better to think about this now than later. Especially since you could potentially get into serious trouble.
Google is a search tool. It uses thumbnails to point to pictures on the web when you look for images, just as it points to text in a standard search. The images have the protection that each site owner gives them.
If you take your own picture, put it on your site and say, "Here, this is free for anyone to use as they wish," then it is up for grabs. If you say, "Here, anyone who pays me $1,000 may use this picture once on one page of a site," then those are the terms.
I sure hope you don't get any large bills! But don't be fooled. You could.
In practice, the whole subject is so confusing and so often abused that a lot of people ignore the rules. But as you may recall, a lot of people who downloaded music in the past didn't get caught—for a long while. But when a few artists and recording studios decided to go after them a few got whopping bills (from lawsuits) in the thousands.
Personally I wouldn't take the chance myself. I like to get a sound night's sleep.
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