Burned the sky a lot but it was very impressive to begin with. I had some trouble with over exposed areas of the picture but I think they are subtle enough.
I originally shot this photo in portrait mode to catch the eruption but I liked the pictures before the eruption better so I had to do some severe cropping, kinda regret it now because the file is only like 3 megapixels.
Another reason for the crop is a rope that was in the frame to keep people away. I cloned it out and submitted the picture in portrait mode but I've noticed the staff of this site are getting very aggressive with that disqualification bat of doom. I wasn't sure if it would be considered a major element.
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Color, saturation, hue, and lighting overall ae done well.
The clouds may be just a tiny bit overdone. They are to the point where they are beginning to compete with the subject.
The person in the background adds scale to the piece which helps, but with the dark clothing and background the placement is distracting. The posing of the person makes the photo look a bit more like a snapshot than a thought out piece. The mid-stride position here is not the most flattering. Perhaps putting the person on the dirt or grass on the far side of the water would help. In this way, the person would not intterupt the flow, yet still give a sense of scale.
As it is, this is a very good picture, and a little scary for the safety of the person so close to the action.