Your male anatomy is even further off than your female anatomy. Head is so small it looks like he was attacked by a voodoo priest. Sword suffers that "perfect angle" which people use to make it easier to draw a weapon, rather than choosing a more natural angle. Never draw weapons at perfect sideways or 3/4 angles. It almost never looks good. Feet look strained and don't seem to offer a natural stance. Legs and arms way too long. Arm muscles completely off and don't match up to anything in anatomy. Clothes suffer from being "painted" on, and don't actually provide sense of layering.
Lack of background just makes me wonder what you even care about. Doesn't have to be a fancy background. A good background simply just keeps the eye interested, and helps avoid negative space being more noticeable.
Sorry if this isn't what you want to hear, but it looks like you need serious work. There are no strict rules in art, but if you want to appeal to more people (especially those over the age of 14), you should try to make it follow real world anatomy a little closer.
You are free to copy, distribute and transmit this work under the following conditions: