This is a nice image but I think what would really bring it to life is some light shining through the leaves. It all looks a bit flat to me and when I think of English woodland like that I always think of light filtering through it. You should be able to change the translucency in the shader for the leaf. The Xfrog plants I have don't seem to have it set up by default which is a bit of a shame.
Regards,
Jo