But you can take a screenshot of just the picture you want, such as Santa.
$ cd Pictures/
$ tuxpaint-import santa.png
Using save directory: /home/eddie/.tuxpaint/saved
grep: /usr/local/etc/tuxpaint/tuxpaint.conf: No such file or directory
Using 832 x 696 images (for 1024 x 800 Tux Paint
santa.png -> /home/eddie/.tuxpaint/saved/20151224100844.png
pnmtopng: 173 colors found
Then go into tuxpaint to import the file
Import the file.
Then start coloring to your hearts content.
So far I have just only used the magic/fill commands. Have fun!