If I remember correctly the exhaust is the rectangle in the lower right corner of the skin.
Assuming you use photoshop it's pretty easy to get those outlines:
1. Have a layer for your background, for example your pink (Background).
2. Have a layer above this one, which is completely empty for now (Layer 1).
3. Have a layer with your picture with transparent background (Layer 2).
4. Now select Layer 2 and use the Magic Wand on the transparent area, you should select all except your picture with that.
5. Choose Selection -> Invert Selection, Selection -> Modify Selection -> Expand (use a value that feels right for you here, in the above it was 10 pixels) and Selection -> Soft Selection Edge (I chose 5 pixels here).
6. Now Select Layer 1 and use the Flood Fill Tool on the inside of your selection.
I can't guarantee the correctness of the menu labels, but you should find them
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