To help keep final file size for our animation as small as possible, let's crop the canvas size down to the smallest possible dimensions.
Select Crop button from toolbar (it's next to the Mover tool). Three new buttons will appear above the toolbar when Crop is enabled. Select the Options button. In the popup dialog box, select 'Surround the Opaque Area'. Click OK. A crop box now appears in each frame. Look at its placement in each frame to make sure this is what you want. Select the large Crop button next to the Options button to apply (or Clear if you need to start over and do it by hand.).
Click the Save button. The Save As dialog will appear so you can name your animation and then the GIF Optimizer will appear [Animation Quality vs. Output Quality]. Moving the 'Better Image Quality' slider down will reduce the file size by lowering image quality but it should be OK to keep the slider all the way to top for this simple animation. Click the 'Customize' button in this dialog and review all the settings for color, optimization and transparency. I selected 'Optimized Octree'.
Make your selections, click OK and Next, Next, Next, Finish. You can undo the optimization if the final result is not to your liking and you want to try again with different settings. Edit > Undo
If you have any questions, please refer to my animation troubleshooting tips.
I'm sure there's many, many other clip art files out there that could be combined to create an animation. Good luck finding some time for your next animation project! ....Kate