This wasn't made to be scary because of the eyes... I did freak myself out though while colouring this, lol.
Basically her eyes will become that for about a second before size-shifting which she can do at will, or it'll happen because... um... a result of not utilizing her powers much. The eye thing was inspired by Teen Titans' Jericho. Exept he possesses others rather than... yeah.
So she's feeling the power happening and she's not controlling it. Do you think she'll get bigger or smaller? A lot or not much? I'll let you decide.