Ferc Kast

What you'll want to do is draw out her new lip shape with a dark(ish) thin line. Don't worry if the shape spills over to the blue parts of her face.. you're aiming for a more full look (unlike the thin corners of the TSL twileks lips).

Once you have the basic shape, fill it in with whatever lip shade you're going with (lighter pink seems to work best for a Mission look). Technically, while her 'new' lips may spill over to her face.. there's so little detail in the model itself that players don't notice. Besides, you shouldn't spill over too much.

If worse comes to worse, a new lip shape isn't all that necessary if you get the coloring right (no dark reds).. I just did it so she wouldn't look so angry/hateful At least in TSL's timeline, Mission would have alot to be miffed about.. hehehe