Theme
Ok well this is okay and seems you've got a bit of a theme going on here. I see you've decided to make another Luffy piece, which is fine. You've certainly captured that flow up effect like the pain is being sucked or he is falling losing parts of himself. I think that the white space here is your only bad part. I would add more in the background, and if not, then a border or a bit of texture lines like you did in the past. Lineart usually has a lot of lines going on and INKtober is pretty much the same deal to me. Overall it was nice to see another interpretation of this character you seem to love.
~~THINGS TO IMPROVE ON~~
Lower the amount of white space and add up some textures to help this flow more and seem more like an INK piece
~X~