I really think that you pulled this off well. Everything is just beautiful! The mottling and the jagged edges of the wall really look terrific, and the scenery (flowers, trees, creeping ivy on the wall) is perfect.
The only thing that I noticed that was funny was the wooden stair to the upper door of the castle. While historically accurate to be made of wood, If the castle has been deserted for so long as to fall into ruin, wouldn't the wooden stairs have rotted away by now?
Anyway, terrific MOC. The presence of the T-rex is pretty funny, and he's posed very well. Now you just need to put one of those goats on a rope tied to a post out in the middle somewhere, "Jurassic Park" style