So I spent some time on my Xenomorph... sculpted away and added some color as well. Xenomorphs don't really have much color, luckily.
Ultimately, I made April 26th as my deadline to finish my sculpt--which is supposed to be "Alien" Day. I think as sculpting goes, it's pretty much there. I think I just need to pose it now.
Here's what I have so far, rendered up: