I like it... despite the Stars issue,, ... it still looks pretty good,, as for the skid marks, or lack of, we may not be able to see them from the pic angles.. In one shot, you can see the back side of the power pole and it looks like it took a hit from the starboard wing/engine.. but not alot of the background to see if there is other evidence of a skid in, or something else. It is possible like Manny said, to not have alot of markings on the ground, as fireman, I've seen car wrecks with no skid marks or anything ,, so.. ya never know. But other pics or longer shots might reveal something else we can/can't see..
I do really like the waterfall,, and as for the water moving or not,, it could look like that, I've seen natural watefalls in local brooks and streams, and depending on the slopes of the banks of the streams, or how quickly the ground runs away from the falls, will control how much the water is moving.. so with the level banks, the water flow could look flat, the deepness of the canal waters can add the to flatness.. just my humble thoughts..
Over all.. swell job..