It looks a bit better with color, but you still need to work on your anatomy. Again, both look flat and lack depth. Their arms should be thinned down. As for their hands, have you tried using your own hands or pictures of other hands as references? Examine your hand, and practice drawing it. Contract and relax your fingers and observe how they work. That goes with every part of the body, too. Knowing how your bones and muscles work and act will help your proportions and poses.
Again, the lines defining the neck muscles should curve in, like a U.
On the first picture, there should be a hair outline in front of the base of the ear. They're not fused with her hair now, are they?
For the outline, I suggest switching to a smaller brush and putting the pen pressure on. Even if you don't have a steady hand, you can zoom in and create a fluid line from a few repeated strokes. Right now your lines are very choppy.
As for coloring, switch to a bigger brush and leave no white space. It's not like you're coloring with crayon or colored pencil when it comes to CGing. I'm assuming Corel also has access to the layers feature, so don't be afraid to go outside the lines. You can erase the excess later.
Your shading lacks depth, which also makes it hard to discern the clothing folds. Just shading with one color darker than the base color will still make it look flat. I would choose at least three different 'shading' colors; two much darker than the base color and a contrast color. A contrast color is usually shading with the color opposite of the base color on the color wheel, like a dark purple or blue. Alternatively, you can use colors that harmonize with the base color well, such as using brown along with dark red and green.
A highlight color will usually be a very bright contrast color or a bright color reflected from the background or an object near a surface. Never use white to highlight or black to shade unless the picture calls for it (be it monochrome, a nighttime or dark background, etc.). Using those two colors to highlight and shade will make your picture look flat and lifeless.
Again, make use of layers. They're very handy, and if you make a mistake you won't have to delete the entire colored section, just a part of it.