Best method to detect objects like statues and paintings

I wish to develop an application that can detect objects like statues, paintings etc. I tried Object Detection in a Cluttered Scene Using Point Feature Matching. However the technique is not that accurate for my purposes. It can be made more accurate, if I can include more reference patterns, ie photos of the same object from different angles.

Are there any better methods to detect these objects? I tried the Haar cascade Classifier. However the training time required is too much and is not scalable. I wish to be able to detect a large number of such objects. How can Object Detection in a Cluttered Scene Using Point Feature Matching. be modified to so that I can include more referece templates?