It might just be my eyes being blinded by the first serious appearance of the sun outside my house this year, but doesn't that look more like a Snowy Egret? I've never seen a Little with that much and that bright a shade of yellow facial skin.
could be - I guess it depends where the photo came from. But nigripes from southeast Asia has yellow facial skin, unlike your European Little Egrets. I don't actually know how to tell them apart from Snowy Egrets from a photo though.