Hello Jose,
any more pictures? No offence you know, but apart from the first one, which is a Northern Wheatear for me, too, they are difficult for me. And I get the feeling, more pictures could well change this.
But you know, I like quiz modus:
I agree with you, second is a Northern Wheatear, too (but I get the feeling, that its a long time I saw my last Black-eared Wheateears. And it might well be an easy one for others. Thanks! )
Third seems a Spotted/Mediterranean Flycatcher to me, with the yellowish cast a result of reflection from foliage
Last one is a Little Tern just by first gut feeling=and the same feeling after looking at the pictures again some time later
I hope for more pictures and comments. Thanks!