Hi Doug,
These clouds perplex me too! Yes it's interesting. However, one of the problems with magnificent happenings like passing clouds is the movement and grandeur may just not seem to get into the shot. It might be there but may need work to bring it out or else it might be beyond our reach. When you see the layers of soft wisps of ephemeral list cross another cloud, the light changes in an infinite orchestration of tonalities.
This picture seems to fall short in the magnificence category. But why? Certainly the light clouds are interesting. Still the dark clouds have little form to attract one's attention. Perhaps the shot is far to close and needs to be zoomed out to get the shear width and scope of the cloudscape. To crop closely like this and have the black with little form may lose power that was so obvious to you.
I tried to maximize the impact of the picture as best as I could to discover what you found.