I think there was a thread on this subject a few months ago. It depends on the size and possible wind loads on the shade sail but bigger is better. It would be better to fix to the actual frame rather than the brick veneer. I would use a 12mm eye bolt. For the fascia, look at the builders brackets in Bunnies, attach one to the back of the fascia and the side of the roof frame. Pass the threaded fixing through this hole. If you can use shakeproof washers because cyclical loading may cause it to come loose (same reason Dynabolts may not be so good)
I'm sure there are many different options but you won't regret doing a good job.
Cheers
Pulse