Living in a country peppered by castles used for war and domination ( France-Brittany border), it's been a constant disappointement to see how small they are compared to the fantasy castles in LOTR or GOT.
My hometown castle ( https://www.google.fr/search?q=chateau+nantes&client=firefox-b&prmd=ivnsm&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiiu6HZvarPAhUJJcAKHX0mA6cQ_AUIBigB#mhpiv=0 , https://www.google.fr/search?q=chateau+nantes&client=firefox-b&tbm=isch&prmd=ivnsm&ei=_r7nV8nXFaaSgAbX9pzoDg&start=0&sa=N#mhpiv=2 ) was one of the strongest and in this pic of the courtyard : https://www.google.fr/search?q=chateau+nantes&client=firefox-b&tbm=isch&prmd=ivnsm&ei=db_nV4G3AaiZgAa6lJGIBw&start=20&sa=N#mhpiv=19 you can see the king's house, that's the small white building on the right...quite humble no? (To be true it's the house the French king had build for visiting the duke, the duke's house is the building on the left...a little bigger)
On the other side, on the French-Spanish border, you have the Carcassonne citadel https://www.google.fr/search?q=carcassonne&client=firefox-b&tbm=isch&oq=carcassonne&gs_l=mobile-heirloom-serp.12...0.0.1.196184.108.40.206.0.0.0.0.0..0.0....0...1c..34.mobile-heirloom-serp..14.20.1454.8GSzGWAna1M#mhpiv=6 wich is a lot more fantasy-like, but that is a full city.
And my favorite castle, Neuschwanstein castle in Bavaria, built in the 19th century and made from the start as a fantasy castle : https://www.google.fr/search?q=neuschwanstein+castle&client=firefox-b&prmd=ivnsm&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjW8IbNwqrPAhWkA8AKHWmfCW0Q_AUIBigB#mhpiv=16
That castle is my model for picturing the Eyrie, and it doesen't take much imagination IMO.
So I'd say that GOT castles may not be very real-like but that's for the better.