Camera
Pro- camera that u cant compare - even other phones has 5MP but 520 has much more to boast- all my photos were superb
Con- lack of flash makes it impossible to shoot at low light situations
Processing
pro- it has 1GHz and 512 MB ram-more than enough to carry out all the task- since this phone has Windows operating System .it optimizes the ram usage
Con-though we call it smart phone it is lower end and multitasking at full fledge cant be done or is difficult
overall the phone scores 3 1/2 which fits in ur single palm.with dedicated camera button a best tool for selfie.