Planing a studio painting, using all materials for reference

  Lately I have been trying to plan a painting of  a rocky out crop  near our ranch In Dutch Valley.  It has caught my attention for  years, as I I have seen it in all times of day and light.  It can appear very interesting.  I have recently done a plein -air if it in pastel.  It was a struggle, I washed the surface off and tried again in my studio using photos I had taken that day.  I was not to successful.  I have gone back since for more photo's, and will continue to do so.  I just am not sure of the right way to view it.  From down low,  or from equal elevation looking at it from across the draw,   morning, evening or what?   I would like to come up with a composition, then use all my materials for an indoor work with oils-----So to that end I proceed.

       Today, using photo's and the first plein-air, I painted with Gouache on stretched Grey toned Canson Mi-teintes, which is a wonderful paper.  Since it had been stretched, then dried over night,  I could use plenty of water while painting and not get any warps or wrinkles----This is how it came out----         I didn't like the lower tree, so I wiped out the paint.   I paused to think what to do----I like that gouache paint dries so quickly. 

                                             I decided, since this is a fact finding effort, also a learning effort for both compostions and mixing color using white, that I didn't do to badly.  I feel I learned a lot, and decided to go ahead with corrections and plans for a future painting, using my pastels.  They really did help me go head and continue planning.  This is where I stopped. 
                           Thursday, I get a lesson in oils  with Ray Freeman, and hope to use this as a subject.  I have many pictures, and am still doing thumbnails with pencil for a better composition.   Using gouache today as it snowed outside my  window was fun and I plan to use this paint again.   I do really like the canson papers for pastels , too.   I experiment with many surfaces.