Lots of kids don't wanna have their face painted, from my experience especially boys. So this one will be fast Aquaman arm design great for those busy events!
Using a flat 3/4 brush, paint the shape of a gauntlet. Load your brush well with gold facepaint and then dip one tip in black to get more dimensional look.
With the same brush use the whole width to paint lines through the shield. The darker part should be on top and that will give us that 3D look.
Paint black triangles on each tier of the gauntlet. Make sure that the tip of the triangle is facing to the hand. I purposely dried out my brush (gently wipe it of in a towel) after loading it with black and then painted inside of triangles to make them pop out more and give them dimension.
To finish up the design, paint Aquaman's logo and shade the whole design with my blending brush and Starblend black.