the atmosphere and shading are great, which is obviously what you set out to do. the structure of the castle is a bit odd, looks like plasicine, but i'm guessing pretty hard not to using brushes so i'll let you off :)
thats why hes practising you fool. http://www.good-tutorials.com will help you get to grips with photoshop, and deviantart has brushes. http://www.dafont.com is good for fonts or http://www.abstractfonts.com to name a few