It seems that you can't understand what I'm trying to point out, so I went ahead and made up a very simple tutorial to make you see where you've been doing it wrong, and what can you do to make it look how it should.
There you go. I hope you understood my 10 minutes work, and that it will help you to understand why your skin isn't of acceptable quality.1. Defining the base
Select an area you want to work first, and color it fully and entirely in the one color that is easy to different from the other colors on the skin. I've decided to re-work the bracer on the legs only, so I went forward and colored it in a slightly pale skin color.
2. Drawing the Outlines
This is the easiest yet the hardest step to do. Following the idea you have in your head, draw out the outlines with 1 pixel black brush, just to see and make the shapes there. I've decided that, like any bracer, this one should have a rim at the edges, and I've added a few round spikes just to fill up the too empty space in there.
3. Basic Colors
Keep the outlines layer on top of everything, and slowly paint in the basic colors you want. I've decided to keep the skin-pale color for the bracer, and colored the rim in sharp golden color, with spikes that will be metallic, and therefore they're gray.
4. Simple Shadows
By using a 10 to 15% opacity black brush, slowly add shadows. Now, here's the catch, it needs to look realistic. Following the common sense, the light in Warcraft skins always comes from above, meaning that anything that has something above it, will have a shadow casted on it. I've did the frontal shading system in here, which means that I've kept the light directly in the center, while shading the sides, as when I've looked at the model, the shadows will appear on sides of the wolf, and not in front, which would look wrong.
5. Light source
Following the step above, in the end, your object should look like this. Notice that I've also added a light source, which are those whitened parts. Light source is where the light hits the object. The bracer being metallic, it means that it will reflect light in a very narrow way, and also a very bright color, almost white. For skin, for an example, the light source only applies a lighter color of the skin, never white, as it would make the skin look plastic. Metal objects tend to have a lot of contrast, and sharp contrast on top of that.
6. Shadows, shadows, shadows, light source, shadows
Repeat the steps until you get something like this. This is shading and a light source doing, nearly finished.
7. Tuning it up
Add whatever finishing touches you want to add.
This is how our bracer looks like now, applied on model. Notice that there's a mistake done, where I've drew the bracer over the front feet, resulting it in to stretch a little. It shouldn't, and it should be fixed. Also notice that the whole bracer is a little too bright, so I should fix that too. This step is the most important one, whenever you do something, like drawing the base, always switch to preview how it will look like, to avoid the errors like I got.
I'd also suggest you to switch to GIMP or Photoshop, as you can't do anything with Paint, really.