'Escher's Terrace'

This is my very first iso pixel work. I've duplicated a scene by escher and rendered it into an iso pixel form. I plan to do many more like this in the future. A few things in this image were a challenge, and I still have many things that I'd like to clean up or detail, such as the grass. The original image can be found at [link] and as you can see, there are a few differences between pictures. Any suggestions and comments are appreciated. Thanks