I said I wanted to start skinning some FSX stuff - having done some other skins with PSP, Photoshop and GIMP. I'm still pretty rubbish at it - and having used PSP 5 for years I still am an absolute amateur as far as knowing my way around the application is concerned. It doesn't seem as flexible as the other two, though.
I have only used Photoshop and GIMP to make dds format skins - and to a step-by-step tutorial in both cases, during which I did as I was told, and learnt very little.
Please bear these facts in mind, when offering advice.... STUPID
I decided to start with a nice and easy fictional RAF training scheme for a Piper Arrow. I painted the colours for the fuselage and two wings as separate files - this is the appalling result:

I have no idea what's gone wrong. Could it be that I painted the left wing 'as is' but changed the colour in the fuselage and right wing to 16 million?
The reason I did that is because after painting the left wing, I was totally unable to match the paint colour for the other wing and fuselage. The only way I could get the same hue was by increasing the amount of colours from 256. But all of the images were originally 256 colours - so I don't understand why I couldn't get the same hue in the first place?
Any simple help greatly appreciated. HELP