You can see the design lines of the landscape meet from piece to piece. I labeled the pieces a,b,c&d to keep the design in order.
I cut out the bag pieces of the base fabric, leaving about 3/8" extra fabric around the pattern. Then I interfaced with iron on interfacing. I drew the landscape lines on the fabric pieces, and machine stitched along them.
I cut fabric to cover the top area of landscape and machine stitched it to the base fabric, using the previous stitching as a guide. Trim the top edge of the fabric close to the stitching.