I love the bold lines and the way the hand has been drawn in a variety of positions
Hand study- great project
Drawing Hands by Majnouna on deviantART - she sells a book (e or hard copy) with similar guides for the entire body, including facial expressions
NOOWIT - preview edition
A Better Way to Travel | dopios
If the sampling distribution for x is normal(μ, τ) with μ known, and the prior distribution on τ is gamma(α, β), the posterior distribution on τ is gamma(α + n/2, (n-1)S2) where S2 is the sample variance.