I felt like some of your pans (especially the first two) were waaay to slow, like the biker was flying from right to left and by the time he hits the edge, hes going out of frame. That can work in some situations, but I feel like a pan where the biker stays in the same spot of the frame for the entire shot would look 100 times better, imo. Overall, some shots i felt like you were trying to keep or adjusting quickly to movements and it wasn't as smooth as it could have been. Filming a biker riding down a trail at high speeds is definitely not the easiest shot, but i feel like knowing you as a filmer, you could have done better. Also, some nice cuts shots of close up tires on dirt/rock (either slow or fast) and or petals, face, etc would've been a nice addition too.