Dramatic Seaside Sunset

I need your advice, please. In the upper right corner of the painting there is an area designated to #4 color. However, within that area there are multiple other areas to paint which are also labeled #4. They should be a different color, but which one or ones? Can you please advise? Thank you. Can’t wait to finish!

Amazing hobby

Love this seascape, it's full of vibrant colours and easy to paint. I've enjoyed the process and how relaxing it is to immerse yourself in the process. It was also valuable to get the paintbrushes, it was a "one stop" experience.