Picture regal plumes upon those vacant hills?

[NewHopeR]

Does " Picture regal plumes upon those vacant hills" mean "majestic picture adorn those empty moutains"?

Context:

Picture regal plumes upon those vacant hills;
How blank and bare his hall of state in a country shrine!
Fir and pine by the fane keep cormorants
Till solstice feast days stir the old folks out;

[Preceptor]

In this context, the statement is telling the listener to 'imagine impressive feather-like trees on the hills where no trees are growing.' The clue to what the 'plumes' are supposed to be comes in the third line with the reference to 'fir' and 'pine,' which are both species of evergreen tree.

[NewHopeR]

In this context, the statement is telling the listener to 'imagine impressive feather-like trees on the hills where no trees are growing.' The clue to what the 'plumes' are supposed to be comes in the third line with the reference to 'fir' and 'pine,' which are both species of evergreen tree.

Regal plumes, royal feathers? So "picture" serves as the predicative verb there?

[Preceptor]

'Picture' is an imperative verb, the subject of which is 'you' (either singular or plural). 'You' is left out, as it is understood to be the subject of all imperative verbs.