Your drawings could be a lot better if they weren't so messy. Here's some tips:
• Don't use a one pixel brush. Make the brush bigger. Use the Webink brush if you're using dA Muro, and activate pen pressure if your program lets you to.
• Use Layers for coloring. Don't use one layer and the bucket tool to fill it in, because it leaves white pixels if your lines are made with a brush. Plush you can shade without worrying about going over the lines.
• Shading: remember light sources. Try to make it smooth. Quick Example:
- Open:
• Just SKETCH. Make guidelines. You can always make the sketch layer have a low opacity and then make a lineart layer. I made a little explanation here for your convenience: Click
• Lastly, do some traditional art too. It takes time to get used to a tablet.
Also keep in mind anatomy and things. The shape of the head is really off on the bottom and the legs should be more to the left. Do NOT outline the white circles/highlights in the eyes.