One of the most important things to do when designing tattoos is to make sure that all of your main lines are very strong and that you keep shading to a minimum. Reason being that shading is apparently 'hard' in the same way as feet are.

Will you be colouring it in?

Anyway it is nice, however you need to think about the size of the final piece and if staying at that size or slightly larger it is fine. If full back then I would suggest having more smaller feathers and more detail in the body and sword as you can afford to with a blow up.