You've really achieve a sexy balance of strength, muscle, and beauty all in one tight package! You make me wish this Twi'lek were an actual character from the movie series. I can only imagine the feats of strength she'd be capable of, especially when using the force to augment her abilities! All in all, I love this!
All things are present in brilliant amounts here in your image: Power, prestige, presence, and potency of all kinds. If I were to speak in light, her power is probably the most defined thing in the image, I am really taken aback by the sight of it. I mean really, aside from her obvious beauty (breath-taking in its own right xD), I must say it pails to the presence and what she does just by standing there alone.
The defined muscle in her body speaks of the power and no doubt perfective active she's likely taken with exercise and steadiness of her practice. Her skill is no doubt on a level all unto its own, seen in her powerful stance and the focus in her face. You've done an incredible job with it all: stance, expression, coloring, background, body definition, weaponry (what gorgeous light sabers).