The dusky blue on the car is tremendous.
Quite easy... Base coat 50/50 black and Scalecolor deep blue. Then just keep adding small amounts of the lighter Scalecolor blues to the mix and finally a drop of VMC Stone Grey for the final highlight.
Trick is a big, very soft, quality brush, washing up liquid added liberally to the mix and very light dry brushing. I spent about £25 on one a few years back and it has easily paid for itself
