Yess! You've finished it, I'm very glad! Now this is a truly amazing piece, it is executed wonderously. My favourite part are these rocky structures and how they are all connected. The two spaceships is a very nice touch as it compliments this journey deep into the picture itself. Such depth! The composition itself is also very well-weighted, if you know what I mean. All colours and contrasts look very well! And as with all your pictures, the textures are fantastic.
I know I promised you a crititique, but honestly, what is there to say? This is brilliance.