I want to have a version of this for each of the different primary colors (red, orange, yellow, green, blue, indigo, purple). I tried doing this by messing with the hue, but the results aren't quite what I was hoping for. Partly because the gradient messed with the color change. Like the body would be yellow but the wings and hair would be red. I then noticed the colorized option in the hue slider, which dealt with that, but made the whole image appear more flat. In both cases, there were certain colors I couldn't quite get to come out right, particularly yellow and orange.

I was hoping someone far more competent than me at image editing could try messing without the colors.