That head is just too small.
Not sure if these are larger:
http://www.shop.microartstudio.com/orcs-heads-gasmask-p-208.html
Of course, you could take the normal head and sculpt over it, too. Though that is not for beginners.
Tube seems a bit thick, perhaps try something else? Not keen on having the banner out of the barrel, either. I think it would possibly be better coming off the back.