
This inbound container ship caught my eye because "she has a bone in her teeth" (a bow wave) and because of the nice complementary color pair (Red-Green) painted on her hull. Complementary colors can be seen on the Painter's Color Wheel (aka, the subtractive color wheel for reflected light).
Line, form, shape, texture, and pattern can combine to make compelling images, but finding complementary colors - pairs or triads - is often a good place to start.
-CG TTL