this looks pretty cool so far. ONe thing you might want to try is using a little more extreme colors (donno if that would be the right way to say it) for highlights and stuff. I notice that in your drawings a lot of time you make your lines at a lower to medium opacity, you might try darkening those too :) just a suggestion I think it would make your art seem a little more lively and pop out at people more. Good luck with this one though, I bet it will be really good when you finish
drawn in 5 min
drawn in 15 min