Wow
Ok now this one here your work here is wow, the two faces, the detail, this is all really good stuf for inktober ink work. The use of lines into other lines to create shading and texture detail was really nice and the spot and splashes of color when needed really made this pop out and create a flow from face to face. I think you have something good here, and I was just saying "WOW" when I saw this one. I do think you have too much white space tho, and if you crop this, you'll see the faces more and the character alltogether more in detail and sizing. That is really up to you but it is something I'd consider for the next round of ink work, but your inktober work is always a blast to view.
~~THINGS TO IMPROVE ON~~
I liked this one as it is but you could crop the white space out more and make the main character a bit bitter in sizing.
~X~