Coloring attempt... parts one and two?

I tried to color something digitally a few months ago and realized I really know nothing about shading or color theory. Bright colors that don't clash, right? This is how that turned out:



I tried again this weekend using colored pencils. It only takes me half an hour to draw the crab, but a whopping six hours to color it! Goodness gracious. I still need to make the little guy eat something tasty.