Hahaha! =) Well, don't know how old is he but children are a very good advice as they have no shame telling the truth. Albeit they can't specially explain why, they see very well when something is weird in a drawing. As adults we tend, with the age, of being less regarding to some details (that make a face weird for instance // of course that doens't really count for trained artists who would see the mistakes).
I do know the mistakes in this one but I am happy of the result :D
And yeah my brother likes my stuff ;)
Thank you for commenting @kennitgabriel!