Which features are most important to you? Search/discovery, categorization, tagging, sharing...?
These days I usually just search the web for images and save them to folders on my computer. I have the folders synced to my cloud storage, so I can access them from any computer if I want to.
What even is Pinterest? I see people using it as social media, but I never got what it was for. Isn't it just an image hosting site like Imgur? Or is it more like Instagram?