Sketching before painting

Bismillah Assalaamu Alaikum wa Rahmatullahi wa Barakaatuh I’m lying here recouping from an epidural injection to the cervical spine and of course mind still needs activity so alhamdulillah I decided to sketch a train scene based on several Google images.

I will most likely change lots of it when I am feeling better in shaa’Allaah

Totally crooked at the moment lol

Best I can do at the moment. How do you prepare for your next project. Are thumbnails useful?