This is a sweet scene. You managed to capture the character of Elros' face in a few words and his love for his family with the drabble as a whole. And you managed to work in a childhood memory that is very real and organic to the story. Beautiful.

Lovely--and it puts a somewhat different spin on all that wandering by the sea!

Lovely scene, full of sweet memories.

And it's very visual, too: the beach, the waves, the child's hair shining in the sunlight...

I liked it a lot.

At first, I almost fell out of my chair to see that you'd written a drabble! :) But this totally does what I think effective drabbles do: There is just so much going on between the lines. There is the suggestion of joy with Maglor that lacked with his biological parents. There is, of course, the foreshadowing of Maglor's eventual fate.

And of course it is hella cute to imagine the luminary Elrond as "a great squealer" at the seaside! :D

You convey so much on so few words. I love that you have given Elros a hallmark of mortality when describing his face. 

and the venerable Lord of Imladris a squealer!

Referencing Maglor by the shore made my heart hurt.  

This is lovely - so sweet, and filled with nostalgia and sadness too, with Elros's memories of Elrond, and Maglor's attraction to the sea.  You do so much with so few words - I am in awe, and a little envious at the same time!  I had to read this a few times to savour it properly, it's gorgeous.