Other things I worked on was reducing the size of the central tulip as it was overpowering and this change helped show more windmill and sky; making subtle changes in tone on the vase and the petals and leaves; getting a more 3D layered look by developing the stalk shadows on the vase and over the swing bridge. Then developing the style and tone of the buildings and removing their roofs, developing the canal boat and putting silver on the windmill blades.
I'll have to wait until tomorrow to see where it takes me from here. ... if anywhere!? I think it is really working for me - hurrah for zentangle practice.