From reading the LOTR I tend to think that embodied maiar were able to look much larger on some occasions.
Gandalf at Garadhras:
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In the wavering firelight Gandalf seemed suddenly to grow: he rose up, a great menacing shape like the monument of some antient king of stone set upon a hill.
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Balrog at Kazad-Dum originally seemed to be
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a dark form, man-shaped may be, yet greater
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suddenly it drew itself up to a great height, and its wings were spread from wall to wall
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