Photoshop - Clone Stamp

The photos we took to use for stop motion had the date in the bottom right corner.
I used Adobe Photoshop and its clone stamp to take out the date.
I had to find sections in the photo that were the same colour as the background of the date, and use the clone stamp by pressing ctrl and click to copy that colour and put it over the date.
It was easy to do this when the background of the date was just plain white, however it became very difficult and time consuming when the date was over her arm. As her skin has many different tones I had to zoom in as much as I could to copy tiny sections of her skin to ensure it looked realistic.
Here is an example of one of the photos I changed.