I would say the problem is with attr_accessible :pins_attributes in Image model and another attr_accessible in Pin model. Usually all the attributes except the id are accessible (means can be mass-assigned), but if you declare an attribute as accessible - you have to list all the attributes you want to be mass-assigned. So, try to list the attributes in both models, or just set attr_accessible :all.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.