It's not worth more, it looks plain, theres barely any depth to it, no shading, and no, the
white lines you tried to do, to make the plates look 'metallic' are not shading, well, they
look like highlights, but where are the dark bits? you should make it look more real
and realistic, and make the liquid more detailed and have more depth too.
I could recreate this head, and make it look a lot better. Maybe even increase the price of
it.