need to improve my tree quality

[jabranbaig]

hi guys I desperately need to improve the quality of my trees right now the current tree quality r that one now do you think the orange and red trees r disturbing the image or give variation in the image and also what is wrong image now I mean I need some hard feedback that I can push my self to do something out of for good please give some help a settings of vray render of what sort or vray mat should I use the setting or something I am self thought artist I would get what is suggested here also some overall feed back of the image what should I do to improve it