I'd check the white balance on your camera - the first two photos have a blue cast to me. (Maybe someone else can confirm.) Were these shot mid-day? In my experience, I've found it's hard to battle that harsh light esp. on vehicles; you lose some detail in the shadows because the difference between the bright parts and the dark are so drastic. The second is composed the best for sure - great angle, nice background. Maybe try that level again but come a little to the front of the bike? Nice work nonetheless!