There's an obvious similarity between these images and the earlier Warhol Variations I'd posted. They are derived from the same source material.
I don't recall the order in which I did what, but the general idea is to build an image in layers using differen sized versions of the same source in each layer. The above image has three layers, so the source material is used at three different scales. This image only has two layers:
This next one seems to have only two layers, but is not colored: