nice work Igard.

If your upto, you could break up the colours even further by taping off smaller sections and using a very thin gray to mist over top.  Gives a faded look to the main colour.  A bit like what Aircraft Modellers do when weathering panels.

This is a bit like using black and white under the main colour when pre-shading, except you do it afterwards (post shading if you like)

The thin gray is about 1:5 (1 part paint to 5 thinner) - and no thats not a typo.

Are you going to add a wash to the entire model ?  If so, be careful of dark washes, as you colours will become darker.

Since you've done a lot of work on the panel lines, you might like to use dark gray pin washes to accentuate them.

keep it up ... looking good