Before I start I would like to say what beautiful art you have made! Now on to the critique, if you look closely all the colors in the picture are either too bright or dark to the surrounding stock image, to fix this i recommend that you add a some curves to new layer and placing it on top of all the layers this will blend all the colors into a soft blend. If you don't know how to use curves do a google search and there are many many videos on youtube. Now the reason why im saying this is because if you now look at the lamp-post you can see where the grass and the post do not meet in hue and shade. Overall I would give you a 4 STAR rating because of the vision you had!
Good Luck In The Future!