When it comes to landscape photography, it is very easy to get a little obsessed with the “rules” and the traditional way things are done. But abiding by such conventions (blue hour, golden hour etc) is not always possible, and that can be a wonderful thing.
These landscape photographs were taken with less than ideal lighting conditions but managed to come away with gorgeous and interesting results. Note how these images mainly compensate for the less than ideal lighting conditions with extremely strong composition. You'll also see that many of the photographers were patient enough to wait for slightly better lighting on otherwise flat days.
If strong landscape composition is one of your photography goals (and it should be) then the photographer who springs to mind for me is Adam Williams whose landscape compositions have won a LOT of competitions. His course on landscape composition is a must see.
Notice how the light, contrast and framing of the green field above draw the viewer's eye straight to that part of the photograph? That is a technique that is honed in on by Adam Williams in his landscape photography composition guide. If mastering that is something that is important to you, then it's the best course around at the moment. Take a look at it here.
The next step to start taking powerful landscape compositions is to hone down through a detailed course like Adam Williams'. His landscape composition bundle is available here.