Still, you have to start somewhere.
Below is how "I" would approach this paint scheme, please feel free to modify as you see fit.
Sometimes I feel it is easier to borrow someone else's idea and build from it (much like the advice I give here, "stolen" ideas applied).
I am using
this colour chart for reference.
I can see the base-coat is a light grey.
Maybe prime grey to help speed things along?
Try to use a primer you may have experience with, even better try a test piece first.
Distance spraying, nozzle type, weather conditions like humidity and termperature all decide how the primer behaves.
Celestra Gray (base) for the white areas.
Macragge Blue (base) for the blue areas.
I would use one part Ulthuan Grey to 2 parts White Scar mix for the white areas (Layer).
Lothern Blue (Layer) for blue.
White Scar for raised areas (Highlight, drybrush edge).
One part Lothern Blue with two parts mix White Scar for blue areas (Highlight, drybrush / edge).
Notice that the more organic parts (rather than chitin) are a red-orange colour, that is a direct contrast on the colour wheel (which is good).
I would use Averland Sunset (base).
Yriel Yellow (Layer).
Fuegan Orange (Shade).
I do not think that model uses any shade on it.
REMEMBER: Never apply shade until you are sure you are done painting that area, any touchups after that will look very bad.
I would be tempted to paint carefully into the various holes and pockets Drakenhof Nightshade (shade) in the blue areas.
This is "only" using a 4 colour gradient scheme where each layer covers about 38% of the prior layer (golden ratio: 1.62, you are painting "b") as you draw nearer the raised edges.
Remember to water the paint down a bit, many say like milk... I may lean toward cream since the highlights on that model "pop" so it will need to be less subtle.
I hope that helps a bit with "what you do" with the paint.
