>>5994838look at the image you posted: its all a collection of simpler shapes, squares, recatangles, circles. Draw them first. Add detail on top
Thats the secret. Try to copy it, first only doing the simpler shapes, then copying the details, so you get a little understanding of it.
After that, try doing something from your imagination, so you put to practice what you've learned. It might suck really bad in the beginning, but you've learned something. Repeat until you're good