Everything said so far will serve you well in making you skin better. One more thing that will help- There is a fine line between making panel lines and surface detail too visible and not visible enough. (no pun intended
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If your panel lines stand out too much they end up making your plane look like a line drawing colored in, it breaks up the overall form too much.
Check these pictures of the same skin-
It's not so much that the version with the darker panel lines doesn't look good but more that the one with the subtle lines looks like a real plane.
The best advice is to look at photos of the plane your doing. What do you see in the photos? Any of the people here including me will tell you that we WANT to see the details that we paint. If you can balance the desire to show those details with an aim toward realism and subtlety your skins will look much better.
Now let see an update of your skin
