Characters appearance

Boys:

John:

Brown short hair, brown eyes, small nose, high for his age, (1,25m tall, when he is 4yo) pale skin

Luke and Leo (twins):

Blonde short hair, yellow eyes, tanned skin, Luke slightly higher than Leo. (Luke1,50m tall, Leo 1,48m)

Thomas:

Black short hair, red eyes, 1,38m tall, white skin

Finn:

Red short hair, brown eyes, white skin (slightly darker) 1,47m tall,

Arthur:

silver short hair, green eyes, 1,27m tall, black skin,

Girls:

Clara:

Blonde straight hairs long to her chest, bright blue eyes, 1,32m tall, pale skin,

Grace:

red straight hair long to her shoulders, dark brown skin, green eyes, 1,28m tall,

Elizabeth:

purple straight hair long to her shoulders, lightly tanned skin, 1,30m tall

Emma:

purple curly hair long to her shoulders, pale skin, 1m tall,

Fill the gaps with your imagination. I think that current appearance of the characters isn't so important as it will change as the story progress.