Reference photo:

Cremello Gelding "Legend Blue Centennial" Pastel Portrait, A4   Customer Comment: "Id would like to say a big thank you for drawing two of my horses for me. You captured them perfectly. You are a very talented artist and i would recomend you to anyone. Thank you so much." Katie Perry, UK.

About Blue's color (source cf. Wikipedia):

Cremello is a color consisting of a cream colored body with a cream or white mane and tail. This occurs when a horse is homozygous for a dilution gene (sometimes referred to as the so-called cream gene acting on a red. i.e. chestnut base coat. Cremellos have pink skin, blue eyes, and are a light cream or gold color when born. They might fade to almost white as an adult horse, however.