Just a quick demo on how I painted this sailboat at sunset.
Colors used: Indian Yellow, Napthol Red, Alizarin Crimson, Royal Blue, Burnt Sienna and Brillant Orange and permenant ink
First draw out your image and mask off your sun spot - dry.
I chose to use ink as a base to this painting applying it both directly and using it as a wash to add some shadows.
Next wet the entire sky area. Working around your sun spot start by adding a graduated wash of indian yellow from the bottom to about 3/4 the way up, then add in alizarin crimson, and at the top work in a band of royal blue letting it run down a little. DRY
The sky is not holding the weight I need it to so I wen over it again using the same colors and technique. This time adding a band of brilliant orange along the bottom. Looking better but still not quite there. So lets dry and move on to another area so that I can come back and judge the values.
The sails were added using a mix of BS, brilliant orange and indian yellow. DRY
I noticed that the sky still didn't have the imapct I was looking for so I had to go back and mask off the sails so that they weren't muddied if I brought the blue down so far.
Now all you have to do is go back and fine tune using the same colors you have on your pallet and a fine tip pen to strengthen some of the rigging.