That's not just random snow on the jacket.
It's a message, but where's the key?
Different letters in the poem have different patterns of snow on them. Those patterns are repeated on the jacket. Matching letters, the jacket spells: Todd Hill
Look closely at the rest of the card.
The Dylan Thomas poem segment may help.
Pay closest attention to the snow that falls on the letters.
These snowflake patterns appear on both sides of the card.
How many symbols appear on the front?
The snowflakes on teh front are your alphabet. Using that alphabet, you can decode the back to get the plaintext: "I am an expert in pain and I torture the truth out of folk."
26... like an alphabet.
This is a spin on a classic.
Speaking of spin, notice the "rotation" reference in the message between the two ciphers.
Each "mountain" is made of up of steadily increasing rotation ciphers, starting with rotation-1 at the base and increasing by 2 with each line. The decoded plaintext reads: "I work all around the world but am largely based out of Paris and our HQ. I also recently made the acquaintance of your friend JC."
Find your rotation 1 and climb from there.