The overall darkness of the image does not appeal, nor dopes the bright sky. The light conditions make it hard to expose correctly to show the detail. Also, for me, a bridge does not really meet the Geology challenge
Because of the basic editing requirement more needs to be done to avoid the glare from the sun. Concentrating on one of the arches might have given you a more interesting image. Getting a greater angle on the bridge would also give more interest.
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