Leaves are from a site called antinocetti's workshop in the UK. They are REALLY good for terrain elements.
Re: the meteor and crater, totally agree this is the part that I am least happy with and definitely think it could be improved. However, I think I will just learn for the next project rather than change this one.
For anyone who hasn't had enough,
Full Photo album
Of the WIP shots and whatnot and some more views and angles. You can see how I made some of the stuff in the WIPs.
Thanks for the great comments!