Who are these women?

Over the years I have moved a hoard of pictures culled from various sources as I have upgraded my computers. Most of them I can identify, but there are a few whose origins are lost. I think they may have been distributed in the 1990s to illustrate the capability of graphics software or hardware. I also remember one of a model with a big hat, entitled "Lady be good", which I associate with Apple.

Any information as to who the models are and how they came to be captured on gif and tif would be welcome.

Amber.

Aquagirl.

Brandy.