yes - you have captured a sad expression
(and i am very envious that you can manipulate expressions without a reference)
and yes - that can only be jessica alba.
shading and technique is beautiful,
and the vibrant colors make this piece stand out a lot.
the background could use some work,
i know, i hate blurred backgrounds,
and i'm not saying the because i think i could do better,
because i definetly could not.
oh man, its artists like you who motvate me to keep going :]