I love how you've captured such emotion in Turgon with out even showing his face, just through his posture.You've done such a good job on the lighting, I like how the ice stands out against the darkness, and how Idril's hair shines. Adding to favourites!
Well, you will not find any mentioning of how old was she in Silm or HoME. But we know that "Eldar would beget children only in days of happiness and peace if they could", so we can suppose that Idril was born before or in yearly ages of the unrest of the noldor, and was of course very young in times of the Flihgt, but surely not a child.
The ice might need a little work like you said, but the atmosphere is spot on. I like the way you portrayed Turgon, and Idril, who is recognizable because of her hair but looks obviously weakened. Her plight along with Turgon's care and worried are how I imagined it would have been
How dangerous Helcaraxe must have been. You are walking and suddenly the ice cracks and you fall in the icy water. Is that what happened here? Idril fell, Turgon rescued her and the person in the far left is bringing a blanket to cover them? Very good atmosphere indeed