#51, moving in the right direction. Can we fill the voided empty space. It may get lost if we use the image by itself.Possibly bolder less pointer sun and rays?
#60, We like the direction, but it's not just adding in shading. A bit more boldness and line weight for the image would be great. #67 is nice as well. The idea of the image is starting to look like a B is compeling to us.