Tolkien didn't do an artistic illustration of a balrog, but he did do one with words:
This a quote from just before the Balrog steps onto the bridge and Gandalf has not yet forbidden him to cross -
Quote:
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His enemy reached the bridge. . . His enemy halted again, facing him, and the shadow about it reached out like two vast wings . . .
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ROTK - The Bridge of Khazad-Dhum
And this is just after he has first forbidden the Balrog to cross and it begins to advance -
Quote:
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The Balrog made no answer. The fire in it seemed to die,but the darkness grew. It stepped forward slowly on to the bridge, ans suddenly it drew itself up to a great height, and its wings were spread from wall to wall.
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ROTK - The bridge of Khazad-Dhum.
Once the bridge breaks,the Balrog was not able to use his wings of shadow -
Quote:
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With a terrible cry the Balrog fell forward, and its shadow plunged down, and vanished.
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ROTK - The Bridge of Khazad-Dhum