I will run through my usual painting process stage by stage with pictures. It is a multistage process.
The preshading works best with lighter colours though it does have some utility with darker colours as well. Consequently my process for the top camo is therefore very different.
Naturally I masked the underside areas that might catch overspray and, of course, a solid demarcation is needed between the Sky and top camo. The inside of the flaps had been painted grey-green and masked off.
I start with the lighter of the two RAF camo colours, Dark Earth.
As you can see the pre shading is quite muted and subtle.
My next stage is to post-shade with RAF Light Earth. The object here is to replicate sun fade and lighter areas that would be caught by the sun. This time I focus on the inside of panels but, again this is important, not in a tidy orderly way, is not like doing a mottle camo. After this is how it looks.
A bit 'spotty' but it's not finished here.
The next stage goes back to using Dark Earth, MRP paint does not need thinning normally but for this I use just a splash of Mr Levelling Thinner in the cup. I apply a series of mist coats, giving each coat time to dry before the next. This is to blend the different areas to create an overall organic natural look.

In the picture above it is difficult to see. But it is more visible in the wing close ups below.
A couple of things about this approach.
1/ The effect will be more apparent under the final matt coat hence the need for being subtle.
2/ I use MRP lacquers and this technique works exceptionally well with lacquers. If you use water based paint it can work well with them as well but you would need to be more patient as they take longer to dry and, of course, need time to cure before masking over.
This is pretty much foolproof simply because by finishing with a series of mist coats the final effect is controllable.
Next I will be masking up over the Dark Earth ready for Dark Green. I will use exactly the same approach.