I'm really digging the lines on this bio. The snout area really stands out to me as "different," which I really dig. As far as Greebles go, as I've stated in the past on other threads, if you can justify their use, then cool, but simply sticking on kit parts to make it look "tech" bugs the **** out of me. Granted, there is a fine line with that argument, as well. The ONLY thing that kind of stands out to me (And this is just my take) are the two cheek hoses. On the one hand, you could argue it's a great motif to pull from other bios. On the other hand, you could argue it's been done enough. I'm not saying don't use hoses, but maybe think about how to incorporate them in a different curve, maybe more than one, different entry/exit points. Regardless, I'm really digging the design and am looking forward to updates.
As far as alcohol versus water, here are my two cents. Each has its advantages. Water is great for knocking off clay dust (Scrapings) and for initially knocking down ridges for when you don't want to melt the clay. I prefer 99% over white spirits per the odor. The WS give me a ******* headache, even the "odorless" ones. The 99% also feels like a cleaner, more controlled melt, and evaporates faster than the spirits. 91% alcohol works, too, just knock as effectively. To apply it, I dig using a little pump mister, few squirts, and then hitting it with a brush, working in overlapping small, dime-sized circles and/or figure 8's, to really keep it even. Just do a little at a time, not to hard because once you stop, the alcohol will continue to soften the clay until it evaporates, so if you take it to "there" it may keep going to, "Ooops, too much" and you've lost details. Have to play with it to understand this concept. As for brushes, some people use those small round-tipped paint brushes. I prefer the ones for stenciling; a little bigger, 3/8" diameter, and a tad stiffer, but that's just me.
As for symmetry, might I suggest: