A whale as a mascot may be a litle bit too big, but a penguin is a must
Bakers would have more sense with farmers, but I guess they will make chefs for the butchers.
Entertainers for the alchemist sounds nice, and that give them room to make really nice and original minis.
Bankers - I don't know they don't seems to have any relation with any of the guilds (well, ratcatchers and morticians doesn't have much similarity either), maybe with the masons, but I think masons - miners would be better.
Whalers and fishermen is kind of the some, don't you think? Maybe they can diferenciate them esthetically somehow but I don't see it.
I'm very impacient, I want to know them already.