Based on Shakespeare's influence, the Fairy Queen or Queen of the Fairies was a figure from English folklore who was believed to rule the fairies and is is often named as Titania or Mab. In Irish folklore, the last High Queen of the Daoine Sidhe - and wife of the High King Finvarra - was named Oona (or Oonagh, or Una, or Uonaidh etc). In the ballad tradition of Northern England and Lowland Scotland, she was called the Queen of Elphame.
In the first one, Percy looks so excited. You can just hear him saying, "c'mon, let's go kick some butt". Annabeth is looking at him because she's worried that he'll leave her like all the others did and she can't go through that again. In the second picture, Percy look s more serious because he knows it's not a game anymore and Annabeth doesn't need to look at him anymore. she know's he'll be there for her.