For Windows, double click the photo (jpeg file), which gives you "Windows Photo Viewer."

Step 1: Click the last choice, "Open," and choose "Paint."

Step 2: Click "Shape," and choose any shape you like.

Step 3: Then, click "Fill," and I picked "Watercolor."

Now, you can mask any part of the photo at will.

When you are done, just save the new file.

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Two giant ducks!