This is great. Annabeth is quite pretty and she looks so peaceful. I like her outfit. Its stylish and cute but sporty too. The way Percy is holding her and kissing her forehead is just about the most adorable thing ever.
The background is incredible. Its so detailed and realistic, especially the architecture.
It's a simple and free 3D program. I use it to make architecture designs from scratch, and then I paint over them like in this drawing: [link] but there is also a 3D Warehouse that has thousands of free pre-made models that you can download (Which is where I got the shoe reference from). It's so helpful with figuring out perspective
If you are interested, you can download SketchUp here [link] and here is an awesome tutorial for it [link]
Everything from the sky to Percy and Annabeth is just simply beautiful. Not cool, not epic, not "OMG THAT IS SUPER DUPER AWESOME" but instead it's beautiful. While those other three statements are alright, this deserves much more than a lame "great job." It's breath-taking-beautiful. There is not other way I can word it correctly.