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How big shall be the classes of BOW classifier?

I am using a BOW classifier for classifying my input images (motocycles (front, back, lateral, details), cars (front, back, lateral, details), interiors (front, back, lateral, details), or other stupid things (commercials, trees, rooms, etc)). I have a question how big shall be the datasets used for training? I am asking this, because it seems not to evolve very much on each increase of 100 images per class. Right now I have 400 in each class. Any suggestions?