You succeded in capturing the scene of an impact pretty well. All the energy and the heat and the cracked ground in contrast with the cold ice and snow... It look astonishing.
The technique is very good; the lights and the shadings are in the right places. It looks realistic because of the multitude of details and of the well chosen chromatics. Likewise, you managed to embine red and blue, which are opposed chromatically. This is not easy , because you must careful making the transition from a color to the other oneor it won't look good.
Also the effects you created are very important because they help bring the watcher in the athmosphere the artist wanted to create.