It looks like the Moonlight Greatsword from King's Field

Reminds me of LOZ. I love the essence of the sword's power in its radiant blue color, that its location gives the aura that it's in a hidden or guarded place- the sword's use is meant only for the great heroes with the needed swordsman prowess in times of need, and its mystique as the bane of foes would further increase significance of the blade.

I realize you had to work within certain confines and there's likely not much you can do about some things, but I offer the following critiques: perhaps a little more effort into the sword hilt, such as raised reliefs, and runes on the pedestal, such as on the base of the pedestal. The imaginary on the background wall should be a bit darker on the stonework with the paintings a bit brighter/varied slightly in coloring, and perhaps a flag or banner of some kind, even if it's just a hint of or portion of one in the surroundings of the pedestal.

Great painting, especially the lighting and stuffs.
And it's made with computer? O.O
But can I ask you a question?
What exactly is it? xD It looks like a big enchanted sword (Obviously..). Maybe the Sword in Stone from Merlin?