Cool Build :)

Do you want me to help make your castle? I am a great builder!

I would love to see some nice interior too :)

Considering that this is your first I must say it is a pretty nice castle.  Maybe a bit more detail otherwise, I think this is a great start!

Not the worst start i have seen. Even when i think back to mine. ^^
Try to add some decorative elements to the wall. like supports or something to make this huge boring walls more exciting. Try to add more decoration around the windows too. This would give way better look. Add a drawbridge and a some water around... and keep up the good work.