After seeing my piece from last night with the mountains and fiver scene I was asked to do a tutorial on this process. I am not a teacher and this is only my second one but I am a firm believer of *just go for it.* The worse that can happen is you don't like it in the end .. but you will learn a lot in the process.
I start with a pieces of muslin about the size of the * picture * I want to create. I laid that on my table and cut a piece of SKY that spanned across the muslin then I cut my SNOW and did the same. With the tree I ironed on some wonder under on the wrong side of the fabric and drew a basic shape of a tree and started cutting. I laid that on top of the SKY and SNOW for placement.