At a first sight it looks Awesome, However when watching the High res,
You can see that it is very Lowres, wich brings down the chop Alot!

However The work is done good, You should've used High res C/P items though.
And you should spend more time when you are doing selections, Would bring some stuff up better. Such as the wing, and around the Roof. You can see a small Blackline just above the roof.
But if you would have used Highres stuff it would look so much better!, So think of that when making a chop, ALWAYS use Highres stuff!
Peace
//NiBs