Often when I'm working large, especially four feet and up, I find it nice to work on smaller pieces while layers of paint dry. This helps me to clarify colour palettes and mark-making and allows me to experiment a little before trying it out on such a large surface. Basically, it helps me find my way as working large can be a little overwhelming at times...though I do love it. But, I have to admit that I like working small, too, so I am glad to move back and forth.
'Honouring the Ancestors': Awesome Airdrie
AIRdirondack Art Project
'Counting Crows': Great Places Plan