please, dont do it alone.
1. Lot of crevasseves between barrels and priyut-11. if you dont see trail - you have problem.
2. Naked ice above Pastukhova Rocks - more than 400 meters up, about 30-40 degress. You should use fixed ropes. But in february not fixed ropes, of course. You should carry own rope, icecrews and other ice stuff. You can spent more than two hours for this part. Descent can be more dangerous - better if you have partner. Look at my profile photo - it is. In May.
3. Strong wind. Cold+wind = double cold, you know. But more dangerous - strong wind in ice part. One mistake, one step without rope, one movement without safety baley - you are dead. Its serious. In 2007 two climbers dead (poland and austrian) in the same point and two other was broken - only in two weeks (end of April - first day of May). I saw dead body
4. Time gap. If you dont reach the summit at 13:00 - go down! immediatly! Elbrus has very fast changed weather and usually it changed after 14:00 any day. In May 2006 11 (ELEVEN) people died in ONE day at Saddle on descent because no visibly. Looks like Everest'96. Remember it.
5. Because Priuyt closed in winter - you cannot use it for rest on descent. So, +1-2 hours for back way. Dark started at 16:00 in February, i think. Just calculate.
6. "Kosaya polka" - traverse East summit face from ice part to saddle. If lot of snow - you should broke trail. Its hard. Many people have rest in this part and fall asleep because exhaustion.