Your right, I can tell the different's in each. One reason why it is good to expand your skills and try new things color wise. Shading helps make it look so much better then flat coloring, paired with a unique style, you can go far. Not to mention its fun just to mess around anyways, even if it doesn't turn out at all how you expected it.With your newer works, your shading is much more blended and soft, though both line arts have a unique style to them.