ecols, welcome to
RP.
i agree with the others. very good for a first time.
what you can do to make it just a bit better now, is take your clone or heal brush and set it at a fairly low opacity, like around 15 to 25, somewhere in there and go over the areas where a touch more blending and smooth transitions would help. do this on a blank layer with 'use all layers' set and make sure that layer is on top of the rest of the layers. and for an even finer/smoother blend there, add just a tiny amount of gausian blur to that layer, like 1 or 2. all this will help erase any left over clone marks you might have.
craig