[Gregster]

Looks pretty good Kyryllo (not that this is unusual or anything).

Though if I may contribute my $.02: it does not appear as though you're looking in the direction of the target when kicking. It's generally a good idea to have your head all the way around so as to have your target clearly in your line of sight by the time you've pivoted around and chambering the kick; thus, if your opponent moves you can adjust as necessary (such as pulling the kick and following through with a different one more suitable one, or simply advancing in the direction of your opponent).

It also looks to me like you're leaningback quite a bit when the kick is completed. I'd not go so far as to say this is "wrong" since subtleties in technique vary widely (and if you're throwing it high, it's necessary). Though you may wish to try limiting how much your upper body is leaning back when throwing a spinning back-kick at torso level; I think you may find that it gives you better balance and improves the speed and stability of any kicks you follow it up with.