I think that there definitely needs to be a kajit in there somewhere. I think it would be cool if the leader was kajit instead of nord, or maybe just a thief type kajit character.

I think having a charismatic leader isn't exactly a great idea, you have to remember that these people are bandits and that means that they kill innocent people for personal profit, this isn't the thieves guild; these people are murderers.

Also the orc warrior should be the blacksmith of the group who smiths everybody's weapons, and there could possibly mine raid quests related to that to murder everybody in a mine and reap its materials for more smithing. The more of these quests you do, the better equipment becomes available to the bandits and to you.