It can be the one on davidships link. The window is a 5 parts thing, 2 round portholes, and three irregularly shaped panes, seen from inside at https://photos.croatia-yacht-charter.com/Ferretti-681-1555_15b.jpg

I was agreeing with @rarcand that this is not ESTELLA (which doesn't have this big window). It seems that it is virtually standard in the Ferretti 681, but there are quite a few of those around, so for me this remains a Mystery Vessel.

Thank you all!

Well spotted!!

@rarcand: Yes. you are right. That big black area is puzzling - it goes down a long way, clearer in the other two photos:
http://www.shipspotting.com/gallery/photo.php?lid=2877285
http://www.shipspotting.com/gallery/photo.php?lid=2877284

So perhaps this Ferretti 681:
https://www.croatia-yacht-charter.com/motor-boats/Ferretti-681-kls_yacht/

There seems to be a lot of Ferretti model 68' (or 680) around, some for sale, other on lease. This one could be Estella but the centre side windows seems larger than the one of Estella.

Not at all Phil, no bad :) Cheers to you both

ESTELLA then.
http://www.shipspotting.com/gallery/photo.php?lid=1880375

I'm pretty sure that's the same yacht:
https://www.yachtbooker.com/countries/croatia/novigrad/global-holiday-sailing-novigrad/ferretti-68-33622

"Estella"

Yes I think you're right Fergal. My bad.

https://www.boatbookings.com/yacht_search/yacht_view.php?pid=2127

I'm pretty sure this is a Ferretti 680 which would give her a 21.2 m LOA so should be within site standards

Looks to be about 15-20 metres long and therefore likely to be below the minimum size limit for motor yachts on shipspotting.com