Sunglasses – how to match them to my face

Dear readers and Antonio,

With the summer hopefully just around the corner (the weather hasn’t been that great just yet here in Holland), I’ve been looking for a classic type of shades to with either a dress shirt and jeans, or one of my suits. I’m drawn mostly to Ray-ban and Persol for their timeless designs, but since their prices are quite steep, I’m open to suggestions.

Do you have any advice on what I need to look for considering I have a rather large head and long face? Would an aviator work or had I best go for the original type of Ray-ban? I’ve tried on shades but I cannot really tell if they look good on me or not.

Also, any additional pointers on buying sunglasses are much appreciated, this is my first serious attempt at getting a pair.

Thanks in advance for your help!