Did this one yesterday. I used the fluid acrylics and lots of water. It's 5" x 7" and done on Aquabord.
I sprayed it with with water and alcohol (not in the same bottle). Oh yes, and it's got some gold webbing spray on there too...it stands out more and shines a more more IRL.
I'm really enjoying the fluid acrylics and am just using the small sizes to experiment and get a feel for them before I go larger.