If this is truly your first PS rendering attempt, I'd say Well Done! Certainly superior to my first attempt...
What you've shown is a beautiful page with a lot of energy, done in a sketchy sort of style, which is nice but not photorealistic. If that's your intention, you need to stop showing forms in the undercarriage with white strokes on black background -- photoreal means showing form with color and shading, not outline. The red tank, cowling, etc. do a better job of using shade to show 3D.
I would try lightening up the black background of the undercarriage, getting rid of the white lines, and using dodge and burn to show form. Then go in and add white and black line work sparingly to show highlights.
All told, though, excellent first attempt!