Welcome to TalkGraphics Mike

Your picture looks very good!

Putting a car in there driving away would be quite easy, just substitute the text for a car image reducing the size of the car as it appears to move away.
Would be smoother if you used a few more frames but unfortunately the file size would increase
As Raymond has pointed out. your original has a very big invisible background on it that needs to be cropped out.
Could be slightly large to go as a signature though?
A very good effort though and would love to see more of your work here