That certainly does make them look a little more alien and menacing. ^^; It's hard for them to really give off an impression of malign intelligence with eyes that small, though.  I'd probably increase them size of all of them a little, then make the front pair a little bigger still, to help give them an identifiable 'face' area.<br/><br/>I like your second picture's pose if that's what the Arach look like when sitting down, though I don't think having a humanoid pair of front legs would work well if that's how they walk.  I do like that the back legs are facing outwards, though, and think that that's how they should be oriented when the Arach are standing up, too.  That way they have the best position for use as climbing limbs, while the front pair handle most of the regular walking around.<br/><br/>As for the lower body, keeping in mind your description...<br/><br/><div class="quoteheader"><div class="topslice_quote">Quote</div></div><blockquote class="bbc_standard_quote">The spine juts backwards at the first hip-joint, allowing first and second legs to be the same length, and giving the Arach a sexy, bulbous bottom! The spinnerets are located just above the anus, which is just back from the second hip joint. The sex is located between the first and second hip joints.</blockquote><div class="quotefooter"><div class="botslice_quote"></div></div><br/>...It sounds to me like this particular part of their body is more overtly spider-like than the rest of their body, though not to the point of being segmented and covered in hard chitin.  That first image looked a bit too much like a centaur to work, when I think most people here are imagining Driders instead. ^^;<br/><br/>If I can figure out the Elluiki, I might actually try drawing a picture myself, probably going into some direct anatomical detail...<br/><br/>Edit: Okay, here it is.  I messed around in Photoshop and cleaned it up a little, then tossed on some very basic color.  It's intended as two seperate images of two seperate Arach, one from the Warrior caste and one from the Servant caste.<br/><br/>(http://elliquiy.com/elluiki/images/e/e6/Arach_Concept_Art_Kuno_Version.jpg) (http://elliquiy.com/wiki/File:Arach_Concept_Art_Kuno_Version.jpg)<br/><br/>It's a little embarrassing to put this picture up, though.  I can see plenty of places where I made mistakes. =.=; At the very least, I could have added in a background or something...