How can I find pictures in the anew in the content library?

Hi all, 

Sounds like a silly question, but I have trouble re-finding a picture in the content library. In attached screenshot you see one pic from the library, I'd like to use. I have researched for it before and after the go from marketing I try now to find it again, to use as head in my courses. Yet, I cannot remember the exact search words I used and also with the title shown in the screenshot - stock-image.jpg - I cannot find the pic again. 

Isn't there a way to mark pictures one has used from the library, so they are easly findable again? 

Thanks for your consideration and best regards

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