What you’ll need
First, find some real life references.
Start by tracing lines that should help you understand perspective and proportions.
Identify darker areas (the ones in shadows) and start adding details.
If proportions are good enough, you can add details on each area independently.
Identify similar areas, based on both details and lightings. Identify common patterns on them.
Move to new areas that have similar elements to the ones you’ve already drawn, to make things easier
It’s always good to frame your drawing.
When working on lighter areas, avoid drawing too many lines. Start drawing details using shadows.
Keep adding details, you’re almost there...
Render the frame.
Add more shadows and highlights to finish your drawing if needed.