Hey Mjag,
It's not bad to use the PS stuff like bevel/emboss but you'll be stuck with what the filter or effect can do and it might not match what the real shapes are. It's only good if A: the filter matches the reference, B: you're in a hurry or C: you're not picky
I've got to say my standard phrase, look at the reference!
A good photo, or even better, many photos, will inform you on what to do. Look at what you see. In this case the skin is pretty flat on both sides of rudder. Almost like it was one piece of sheet metal with the gap cut out. There is a rounded forward edge where the rudder is overlapped by the tail surface.
Take a look at these photos-
If you want to get really tricky notice how there is some uneven gaps where the panels don't line up. The gap around the rudder varies.
So, here's a simple revision of your wing-
That should do the trick. Now it will depend on how tricky and photo-realistic you want to get
