Itīs pretty simple in fact, but i think it works good (for the SEA scheme at least).
Hereīs how i did it:
1. I selected the panel lines and expanded the selection by 20-30 pixels. Then inversed the selection and added about 15 pixels of feather. Last but not least i deselected the area that was outside the aircrafts
2. So now there should be a area inside each panel thatīs selected.
3. I made a new layer and panted the selected areas that was on the top half of the aircraft bright white, using the brush tool
4. The layer was duplicated so i had two identical white layers.
5. I changed the first layer properties to "overlay" and changed its opacity to about 30 %. The second layer i changed to "hard light" And set the opacity to about 20 %
and hereīs the result:
Hope you can use this explanation in the making of your greta profile artwork !