This composition will be developed with more detail, then used as an underpainting and I'll glaze over it in acrylics.
Many times when I do such paintings, people ask me where I get my ideas. I did a post last year on this blog about stretching your imagination. I believe that imagination is a skill, and just like other aspects of art, it can be cultivated and developed.
That, and I'll leave you with a quote from Franz Kafka: "You do not need to leave your room. Remain sitting at your table and listen. Do not even listen, simply wait, be quiet still and solitary. The world will freely offer itself to you to be unmasked, it has no choice, it will roll in ecstasy at your feet."