look man you better practice more and more because this one need to work more, but still working man
i'm not a manga big painter but i painted in the past
i think its pretty nice but you have to work more you have a good future.
Well! Its a good start I think. You start to do something that is passable then you continue and with patience eventually you will get something nice.
Just like me with my Photoshop skill.
That's without any doubt a good start.
I like manga and anime a lot.
One very interesting detail about traditional manga(in colors of course), is that you can use any color you like to any situation and still make it like it was pretty normal.. So, my advise is use and abuse of color or just do it on black and white or greyscale.