Motorcycle Leather

[Richard]

Hey Wjames,
I like some of the imagery here. However, I do have some thoughts:

Gravel punctures the tire's lung -I like this image. It describes the blown tire well with personification.
and I roll down the hill into the brush, -Between the personification in the first line and the third line, this line feels a little flat. Is there a more jarring way to describe rolling down the hill?
branches clawing at my face
and hands, drawing blood. -Again, the blood image here feels a bit flat. How does the speaker feel about seeing his/her own blood? Maybe use a different word than "drawing"?

I stand up slowly,
stones stuck inside the skin -I feel like you need to go back to the idea of puncturing here. There needs to be a more vivid word than "stuck".
I wear above my heart. -I don't quite get why you end with an image of a heart. Maybe return to the lungs by describing the rider's broken or panicked breathing? Just a thought.

I hope I wasn't too harsh here, and I look forward to seeing where you take it from here.

Thanks for the read,
Richard