Your finished panel looks pretty good. I'd be keen to see how these hold up over time. My full door panels are in decent shape (passenger side has a crack like your driver side does), but I've got some early TJ (lighter gray) half door panels that could use a little love. Getting them dyed seemed like a good idea but I can't find anyone who does it locally.
A lot of it is in the prep. clean, clean and clean. You have to clean before scuffing or you risk getting contaminants into the surface when you scuff. Then clean some more. Then the proper adhesion promotor for the type of plastic you have with the proper timing between applications and then multiple mist coats of color 10 minutes apart. Finally cure indoors overnight then bake out in the sun for a couple days.
4 years ago I did the dash and door panel on my motorhome, they were in terrible shape from 9 years in the sun. Now they look like new and holding up extremely well, the finish is tough. Hoping for the same on these.