The brief it's self was quite broad, there were not many set guidelines as such, apart from keep it festive and nautical themed. I decided to keep it simple.
Essentially I took these two terms, and got them down on paper, and when they were in front off me I arranged the creatures and festive objects in to opposite pairs.
This in turn created some really random but humorous results.
The designs ranged from a dolphin finding a Christmas tree in buried in the sand, to a crab coming across a mince pie!
I used a light water-colour wash which keeps its playfull but precise.
In terms of a rationale, the Christmas card serves it's purpose in that It offers the light-hearted humor. I feel there is a nice contrast between the sea creature and the santa hat drawing of the octopus, just what you need at Christmas.