Fetcha la vache! This seen reminds me of that seen from Monty Python and the Holy Grail. Over all this is amazing! But i must say, you can do better trees. (But, don't trust me, i am horrible at trees. All i know is your tree is better then i get when i sit for a hour putting pieces together.)
I've just seen a photo of you on flickr. Before I saw this, I didn't belive that you are 13 years old. Your MOCs are absolutely beautiful, maybe a little bit too beautiful... You have a great building style. Keep building!
Nice work on this. I like the bridge, and it's really good to see someone putting the time into having a proper interior. For names, here's a few suggestions: Castle Gulwyc (a rearrangement of your user name), Scarabia Keep (due to the golden scarab inside), or maybe Riverstone Castle.
Hmmm. . .definitely some good ideas here. Of course, as I am currently working on a decent sized castle, I might swipe (with permission and giving credit) a few ideas. I especially like the arrow slits. Indenting them is the exact opposite of my thinking, but it is a good idea nevertheless. How about "(compass direction) Gate of Dirkhelm Fortress" for a name (or maybe swap "(compass direction) Gate" to "Postern Gate")?
Though I'm not a big Castle fan (by that I mean the theme), this is a very simple yet nicely done castle. I like the water and also its powerful height: looks like it could withstand quite a beating. Personally, I think a good name for it would be something with Bastion or Stronghold.
Nice landscaping! You should definitely continue to explore the castle genre. As for the name: it should certainly have the word 'gate' in the name. When I post a creation, I just make uo some random name for it on the spot. So, following that system, maybe you could call it Rengald Gate. (Rengald being the name of the castle/city inside the walls).