I really do like the design! To me, steampunk (and clockpunk, retro-future, &c &c) are what makes modelling in 3d so worthwhile! Nevertheless, I've seen a lot of steampunk which is, quite frankly, completely unbelievable and more sheer fantasy than alternate history.
For the most part, you've captured believeability as well as having created a really nice model!
I suppose you could call it finished at this point, but you're already looking pretty good in the texturing department! Why not go all the way with it! A bit of rust, some oil/chemical stains, chipped paint, perhaps a logo or symbol of some sort...have at it!
I've created a couple of robots myself (see my thread here): http://forum.simplymaya.com/showthre...light=bonhomme
and while I modelled them with animation in mind (ie they're cartoony), I enjoyed the texturing phase immensly!
I encourage you to do another pass on your model!
"Ad astra per aspera..."