Manoj, there are lots of things those need to be corrected-some very basic mistakes, like in your last view (attachment) you have placed some tree cut outs at the right side. It's really difficult to imagine a tree which is 15-16 storey or 120-150 feet long. these are minor mistakes that you need to be careful. trees are good but need to be put in right place.
There is always a ratio of the elements in any good photography - 1/3 rule. Go to any photographic site you will get a good idea. this will help you a lot in self promotion.
The last thing i can suggest my mate: study, study & study.