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Hi Jorge,
Fine that you are back, and with such great flies! Of course this is an Asteraceae flowerhead, but to say more is daring. The little beast sits on a hermaphroditic ray floret, which points to subfamily Cichorioideae. However, to be sure, check if the corolla consists of 3 or 5 fused petals (the number of the free tips is decisive). 5 is Cichorioideae, and in this case all florets should show the same construction and there should be no disc florets. If so, we then have the choice between about 3.200 species... :D (Not all occur in Portugal, of course :D!)