Compression for this exercise was done in Microsoft Image Composer
Here is an example of an image compressed only 1% (670kb):
Here is an example of an image compressed 20% (163kb):
Here is an example of an image compressed 40% (106kb):
Here is an example of an image compressed 60% (80kb):
Here is an example of an image compressed 80% (51kb):
Here is an example of an image compressed 90% (33kb):
Here is the same image saved as a GIF (353kb):