Can't see your pics - you have to allow people to see it.
Claiming compensation for dog bites is not easy - does your friend have pet insurance? You will have to claim against your friend, and unless they have some sort of insurance, you will be claiming directly from them.
To make a successful claim you have to prove the owner was negligent in some way. That he was aware the dog has a history of biting people and did not restrain him properly.
If the owner can honestly say, for example, that the dog has never before bitten anybody and you were engaging in rough play with the dog, then you are unlikely to succeed.
Your claim would be based on compensation for pain and suffering, loss of earnings and expenses directly incurred - you must keep receipts of prescriptions costs, travel to doctors and hospital, additional spending on food, cleaning help and so on.
You should ideally have reported the attack to the police.
As this is the dog of a friend, it would be better to ask your friend directly for compensation rather than start action against him.