Making High format Promotional material is a #%$ !!

I spent more than 5 hours, digging out my vector files of a character Illustration I made to render my composition 220% larger. End of it I think it is worth it. What good is it getting printed with distracting pixels. The following Illustration was made with the soldier being given a small touch of manga... enough not to get distracted by the style in my art. I prefer not to use more than 20% if I want manga in my illustrations. I admit I have no experience in manga anyway but enough experience to complement my style with a few trends around.