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I find the front one interesting - I would guess a Herring Gull sub-species given the whacking great bill - one of the Yellow-Legged races? (despite the apparent pinkish upper part of the legs).
The back one might be GBB Gull, and the middle one a juvenile LBB.
But sorting gulls out from a single photo can be very hard even in the UK - I would consider myself out of my depth overseas!
Alan Brampton (Benson)
You do get Yellow-legged in Lisbon and they do have dark backs – the one in front struck me as unusually dark, but I’m sure you’re correct.
Lat/Lng: 38.6977, -9.1827