For your first, it's fine, but hiveworkshop has higher standards than this (or it used to...).
I suggest increasing the amount of colored area in the inside to make the borders thinner, as well as doing something with that background. For example, the simplest background, but quite effective, would be a swirl of one color, whatever you decide. For this, red would probably fit best. To do this, you would use a faded brush and simply swirl it around.
Also, just a quick secret on how to get good-looking blood with only a paint brush: Set the brush to scatter, the color to red, and lower the opacity of the brush. Drag this around a bit, then let go of the mouse, click again and drag this around a bit, do this process until you have full blood droplets everywhere you need, with proper shading and highlights. If you want me to demonstrate this, you'll need to wait until next week, when I go to my mom's house (it's 80 miles away, can't just pick up and leave anytime), and I'll show you layer-by-layer then.