1st ones not doing anything for me, 2nd is awesome but is similar to the last photo you took of Jack and that one was realy something special and makes this one look average. 3rd is my favourite, rider pops out of the image with the colours of his bike and clothes and is well composed. Only slight thing I don't like is how there is a shadow across his T-shirt which is quite distracting from a great image.
Great pictures.