Topographical drawing of a river valley

Original aspect ratio size:
20 wide x 20 high inch ($205.50)
24 wide x 24 high inch ($225.00)
36 wide x 36 high inch ($356.00)
40 wide x 40 high inch ($436.00)
48 wide x 48 high inch ($625.50)
72 wide x 72 high inch ($1,217.50)
108 wide x 108 high inch ($2,462.00)

Standard size:
20 wide x 16 high inch ($186.00)
24 wide x 20 high inch ($225.00)
36 wide x 24 high inch ($298.00)
40 wide x 30 high inch ($356.00)
48 wide x 36 high inch ($436.00)
72 wide x 48 high inch ($815.00)
108 wide x 72 high inch ($1,620.00)
128 wide x 86 high inch ($2,462.00)
150 wide x 100 high inch ($3,269.00)