I was wondering if the head looked off? And any tips would be great 
#Head anatomy
final river
final river
wise lark
it looks pretty good, but his brow is sticking out a little much - which is easy to do because his hair is covering it 
a general tip is to always draw the neck and shoulders with the head, it makes things feel a bit more 'put together'! you can gain a bit more perspective that way
otherwise, great job!