I recently commissioned a B/W sequence from Alorok that you are more than welcome to practice coloring on. The bull in the sequence is based on the one wearing the dark red pants in the following image if you need a color reference:
http://alorok.deviantart.com/art/MMM...-Pen-599689809
I have a number of other B/W commissions you can practise coloring on if you would like.
Gen-Awesome