Pretty nice. Fai's been getting all the attention, it's Kurogane's turn.
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If you're using Photoshop, here's a suggestion. Set your color layers to mulitply, you can then color over your black lines with them showing through. If you're not using Photoshop, then ignore me. ^_^'
[edit] - Just noticed you can use the mulitply filter in PSP as well, didn't know that.
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Anyway, mulitply saves a lot of trouble.