I am no sketcher either I use rough sketches to give an idea of orientation and some of the more obvious features to me. Still if do not start then hard to improve.
On Cloudy Nights there is a forum for posting first sketches and there are some good examples of where you can see the improvement that time brings.
Also there is no such thing as a wrong sketch. Some strive to sketch what they see as accurately as possible. Others like to sketch what they are inspired from what they have seen. Others again bring slightly different emphasis to specific features. Assuming that any skteches posted are labelled accordingly. All work techniques work for it is based on what you enjoy.
Another technique might be, during those times of cloud, to sketch pictures of DSO's as accurately as possible. Could even dim the room to give similar lighting conditions.
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