The light from above makes this so amazing and epic, although Twilight seems to be kind a "carried away" by her own shadow like... OH! Now I got it. Well this is perfect because it IS a TWILIGHT situation. Literally.
This always reminds me of the Doctor Whooves fanfic: Traveler ((Still ongoing)) Which features a corrupted Twilight future version of herself (alicorn form). There is a cover on the site showing the (so described) "Twilighttwo" more grown up like Luna. But I really like to imagen your Twilight here instead, because of the slitty iris and the dark shady colors in her eyes that you managed to bring out, which were precisely mentioned in the fic. Also whenever I read the passages in the fic describing the appearence of "Twilightwo", which instandly leads me to this here image, "Anxious Heart" track of Final Fantasy 7 comes to my mind (actually I feel the need to play the track while reading further), especially when I learn about her fpr the first time! I suggest everyone to read the fic and as soon as they stumble about the first passage "Twilighttwo" gets displayed they should look at your picture here while listing to that track... it's a haunting experiance!