When they are younger, their colors get more defined with each shed. For example, my youngest beardie is about 6 months, and keeps getting more and more red highlights. Kana was just kept in bad conditions, I'm putting her age at somewhere around a year and a half to two years. She came to me as a dusty orange color with some really bright citrus side and eyelid markings, and right now she is this really weird plasticy gray color, which I think is due to her getting rid of all her old, nasty scales from when she was malnourished and kept without UVB in a ten gallon. I'm really hoping that she start to actually shed tomorrow, that would make me sooooooo happy!
The color changing that your seeing right now is very normal, they darken to warm up faster. If yours are two, you'll most likely see maybe a little bit of color definition.
Great pics, can't wait to see after they shed!