Step 25 - Head Light 3

Add some scribbles as before.

Step 26 - Head Light 4

Add some more dark. Keep applying and using layer mask until you get a desired look.

Step 27 - Front Blades

Fill in the blades underneath the headlamp.

Step 28 - Front Blade Highlights

Use a combination of white brush and layer mask to give the blades some highlights.

Step 29 - Carbon Fibre

Select the image above and save it in your working directory.

Open it in Photoshop. Select all then go to Edit>Define Pattern

Step 30 - Carbon Fibre Side Blades

Select the side blades then right click > Fill > Pattern and navigate to the pattern created in the previous step.

Step 31 - Finishing Touches

I've added a white gradient to the glass and duplicated the lines layer and inverted it to get shutline highlights.

Final Results