aardvarks and flying saucers

We have here yet another cover illustration for Ethel the Aardvark

Forward Aardvarkia is loosely based on an example of British wartime propaganda, but features a mysterious, suit wearing aardvark and a fleet of flying saucers.

It looks like an acrylic painting but is actually rendered with the mixer brush tool in Photoshop.
Just in case you are interested, this is the rough sketch. I scanned it and 'painted' over the top.

I like the juicy brush stroke detail the mixer brush tool can make, however it is not as intuitive or as fun as using a real paintbrush