Watercolor is an unforgiving medium! However, you can't get the fluid effects of watercolor with any other medium. You cannot "fix" a watercolor painting. If mistakes are made, the only solution is to start over.
I have been teaching watercolor classes on cruise shops for 5 years. It is fun to get travelers interested in pursuing some new interests.
Watercolor is the best medium to create the transparencies of sky, and water, The wet, on wet technique allows you to drop colors onto a wet surface, creating a spontaneous fluid movement of paint.
Bermuda Beach, 8x10, $95