In the world of imagery, duotone relates to an image that is a combination of two colors, superimposing one contrasting color over another.
This photo was created by extracting the swan from a picture taken at the Campbell Peculation Ponds and inserting it on a fishing boat of a picture taken in Baja Mexico. Then, creating a duotone of grey and blue.
The lighting issues, specifically on the swan, posed the greatest challenge for me. I wasn't able to tone down the bright white enough to have the swan blend in seamlessly.