Blocking In, This Piece Is Almost Blocked In

IMG_3439 Just getting this one started, almost blocked in, I still need to mess with the composition a little. This is from a plien air sunset I did a couple nights ago at the Santa Cruz river.

Question for all my artist friends:

How much do you “block in”  before you start laying on paint? Are you systematic about it or does it depend on the painting?  (Post your response below)