It's not bad for your second try, good job. Over all, everything can use improvement, but that's understandable because you're new at this. Once you get good or decent, there is a lot of cool things you can do with photoshop. I'm planning to eventually get photoshop to, and give digital coloring a try. I've tried to color a panel here and there with a crappy coloring program I have on my computer, but it just doesn't compare to photoshop. Well just to let you know I've been playing guitar for 16 years, so I know how it is to get good at something through experience. The same should apply here with digital/computer art. Well, good luck Dattebayo! I'm sure will start seeing more of your colorings here as you gain experience. Hopefully you'll contribute some very good manga colorings here in the near future. Just remember to practice a lot, and gain experience. Learn from mistakes, and don't be afraid to ask for advice from other artists. If you do these things you'll definetly be on the right track.