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Saxicola rubicola
About 10 cm long.
Thank you very much for all the work you put in helping with id's for the birds. Maybe you could haave a go at this two too:
https://www.projectnoah.org/spottings/37...
https://www.projectnoah.org/spottings/16...
To me, this looks like female Stonechat (S. rubicola) as above - however, on Greece bird-listing I'm also finding the Asian or Siberian Stonechat (S. maurus). Until recently, the later was IDed as subspecies of S. rubicola; becoming a new species recently... so, you may want to dig further to be sure which of the two species is on your photo.