[Gnewsense-dev] How do I put another image next to Freedo?

[Richard Stallman]

When booting, it shows an image of Freedo.
I want to put an image of a gnu next to it.
I need to do this TODAY for the sake of people making a video.

Can someone tell me how to install a different image?

What are the constraints on the size of the image that can be used?
What formats will work?

How can I put a gnu next to Freedo?  I don't know how to use
the GIMP, but I could try it.  Is there anything I need to know
about how to use it to juxtapose images?