I thought I would run through and illustrate my approach to painting including shading. I consider shading the basis for getting realism while also being where some 'artistry' comes in.
I had finished the underside before deciding to do this, so I will demonstrate my approach on the two top camo colours.
My first photo is with the underside masking done to give a solid demarcation. You can see the primed topside with black shading.
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Now, about the preshading above. It's important to remember that this is about colour modulation and trying to emulate the play of light you get on a large surface onto the much smaller surface of the model. This is not panel line accentuation, that I will do as a wash later. What I want is added visual depth with highlights and lowlights. For this reason while panel lines can be used it's important not to be too neat and not to follow them too rigidly otherwise you are in danger of getting a chequerboard effect. For that reason you can see that my preshading looks a little haphazard and 'rough' this is deliberate.
Then it's the turn of the Dark Sea Grey.
My advice is to spray in sections, specially if you are building in a larger scale. Keep pressure low and control the paint flow to build up cover slowly. Proceed slowly, stop regularly and look at progress from different angles and ideally under different light. A fairly subtle effect is best specially for a post WW2 subject like this. You can see below where I stopped. Not quite done yet, but close.
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I then work on the rest of the model, section by section with an aim of getting the appearance very close to the first section painted. As you can see below, I finished the tail and worked forward to the wing and then onto the outer wing.
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Here is the Dark Sea Grey done.
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I then examined the whole aircraft and went back with a little more colour where needed being careful not to lose all the shading, just 'knocking it back' where I thought I needed to. I cannot repeat it often enough, take it slowly, thin coats building up colour where needed. Take lots of breaks is my best tip.
Once done I had to decide whether I also need to post shade this colour. I decided not to as I believe I have sufficient modulation for this subject.
Next I will mask up to do the dark green. My approach will differ, slightly, for this as some post shading will almost certainly be necessary and that's where it might get more interesting.