Hopefully you can see my reply before your trip.
1. You need to prepare winter clothing for 0-5 degree C. Wear in layers, please don't get anything which is white or cream color, because it get dirty easily
. Likely, there will be plenty of snow now.
2. Bring sunglasses, the sunlight is really hurting my eyes.
3. Bring grad ND filter. You need this to take a 'balanced expose' photo.
4. Don't eat their local fruits. Do drink a lot of water. You don't want to get food poisoning during the trip. Make sure your food is well cooked (especially Steamboat)
5. Prepare extra battery and memory card. The battery will drain up easily during winter time.
6. A lot of traffic jam on the way back to ChenDu, so be patient. Bring a PMP to watch movies, animes etc.
That's all that I can tell you. I can't show you any photo yet, as I have no time to process them.
Hope you have a nice and safe trip. I bet you will miss our local food. Lastly, bring some instant noodles if you can't stand their oily and salty food.