It seems like a right of passage to model one of these sexy critters, so here is my take on a Xenomorph. It was modeled with ZBrush, textured with Substance Painter and then I used V-Ray and Maya for lighting and Nuke to finish off the frame.
You can download a FREE ZBrush .ZTL (for private use only) here https://gumroad.com/l/iwxby