In reply to TheFasting:
Without wishing to put words in his mouth, I think what Tim is saying is that you need a great deal of spare capacity, both in terms of technical ability and overall situational awareness in Alpine climbing, especially in Winter. All manner of things can happen that can suddenly make the situation much more serious than expected, also the descriptions of Alpine routes are fairly sketchy so you can find yourself faced with something much more difficult than you anticipate. Or you can just be off route!
Great effort BTW Tim, and nice pictures. Hard to imagine climbing it in Winter, pretty full-on.
I was especially amused by the caption "bienvenue a Chamonix", very apposite.