Bryce skies work like a video camera and monitor. Instead of the video camera inputting a signal you make the signal up in the Skylab using a lot of fancy math. If you had a system of stereo cameras separated by 21 miles you could develop a 3D interpolation of the hues and persistence of the clouds in the sky. Using a team of programmers with a large scale teraflop climate simulation computer and complex Fourier transforms you could develop a mathematical model that closely duplicates the picture you took. You could plug these equations back into the Skylab and reproduce the general look of the sky. Unfortunately Bryce Skylab can only take two algorithms for cirrus and cumulus clouds. It cant handle more than that or occasions where part of the sky is clear and part cloudy like when fronts move in. In long, there is no way without the resources of NASA to bring a photo image into the Bryce Skylab. People like Orbital build complex skies in Bryce using a combination of the Skylab and sky presets on Bryce primitives. These skies could be sold as Bryce scenes. They rely more on art than mechanical duplication to create. Lots of people are happy to stick a photo image of a sky like a background billboard into their renders. Other people like to layer them in Photoshop. Id stick with what I have and see who wants it.