Hello there, I'll give some advice on this. Looks like you've got a good line artwork to start with!
Bare metal is a tough topic, and it can be approached many ways. First thing to refer to is photographs of the real aircraft. Look for how the metal is treated, and if the metal is polished, or more dulled in appearance. Photos are really the ultimate advice for profiling.
Now to technique. The way you'll go at this will depend on the final effect you are wanting to achieve. Photo style realism, or illustration style? I'll post some links to tutorials which include some basics.
This is fairly straight forward, there are several good starting points for metal in this tutorial.
http://www.simmerspaintshop.com/foru...ts-il2-fb.html
Here I created a more 'illustration' style artwork. I show some steps on how.
http://www.simmerspaintshop.com/foru...-tutorial.html
And here is another, not related directly to bare metal but still fits the basic ideas.
http://www.simmerspaintshop.com/foru...asy-steps.html
There are also some examples in the SPS gallery you can take a look at, some of which I've posted below.
Any questions on more specifics, just ask and I'm sure somebody will offer some tips. Be sure to update us with pics of your progress!
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