Well, they have their rules on how big can be in signatures. The link is in Mary Jo's FAQ thread stuck on the Tech board near the top. Sig clips have to be less than 400 pixels wide and high and under 35K. For pictures in clips, I usually make them about 600 wide. Always only adjust one dimension and let the other follow, in proportion, automatically. If you adjust both dimensions, you will probably not be in correct ratio.
I can do your picture here but then you are not learning, and I can see you want to. If you do more test posts, do them on this thread as I have it subscribed to and can help you.
Any questions??
And a very cute picture too.