Lilies with an overlay of color(s) can be very difficult to capture with the camera. Good job, William!
Notice how Pakaris and Rudens Ogle have a unique kind of spotting - not flecks like with tango type lilies and not spots as we normally see, either. I am not sure if this is the only way, but one what to achieve this is crossing a tango type lily with one that has genes for spots or brushmarks at least somewhere in its background. But of course, there will be a wide variation in the progeny, too.