Karl this is the method I used for painting the Dot camo:
First the base coat was painted on. In this case it was VJ English uniform brown mixed with a buff colour to tone it down. Dot camo consisits of 5 colours. The base brown, dark green patches and dots, salmon pink/tan patches and dots, bright green and a sage green. Here is a nice shot of a rero tunic to show the colours and dots.
I've also put rings around to show how the pattern repeats itself. This can make the painting a little easier. Once the base coat was dry the easiest thing was to divide the tunic up into sections. The back is split with the seam running down. Sleeves and trousers have seams running verticle also. This gives you sections to tackle one at a time.
With the pic of the tunic on my laptop and also one printed out in roughly the same size as the figure (this gives you a good idea on the size of the dots) I started by painting the dark green patches. This is the next predominant colour after the base coat. I tried to start along seams and paint a patch then move down and copy roughly the same patch again, repeating the pattern as the original. I only painted patches at this stage, no dots.
Once I had complete all sections I mixed up the salmon pink colour (the trousers this is a little too pink)I then painted in patches, again repeating where appropriate and also started painting in dots. The dots were concentrated on the base brown with only a few over the dark green.
You can see on the shot of the back of the sleeve how I have started along the seam up by the shoulder with a dark green patch, salmon patch, dark green, slamon and so on.
The dots I didn't try to replicate too much but did try and keep clusters the same on each section.