As for the eyes. I definitely do think they should have used Acrylic eyes. I have the Pop Culture Shock Akuma life size bust, which used Acrylic eyes and separate cast teeth and I can tell you, those little things definitely can take a great bust and put it even more over the top! I think everyone has seen this pictures I'll post right here, but I'll talk a little more by what I mean.
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I think what is hurting the eyes the most is that the yellow in the replica is coming off kind of flat. It doesn't look like it has a lot of layers/color variation in that part of the iris. I also feel that it would have benefited from more/and also stronger fades on the inner edge of the iris as well as the outer edge. If you look in the picture from the film, there is definitely a lot of fading/bleeding on that outer edge, using several colors (purple, red, blue) and then they all fade into that yellow. Also the veins in the eyes look like they need to be layered more to give it that sort of depth. In the movie picture you can see a lot of different veins, some stronger than others, while others prob faded out through opacity which gives it that depth.
Now don't get me wrong this is an incredible sculpt and paint job, it's just for some reason the eyes stand out to me and don't necessarily look up to par with the excellence of the rest of it. As for the sclera part being all purple, I don't mind that, that if anything was a creative choice, and I think whether they used purple/black/mixture of both it was a good direction to take it.
And had there not been so many others on my list of possible buys, this might not have even mattered much, as I'm pretty sure this is the best predator 2 bust that's out there to buy right now. I am a little wary though, because I'm just catching on to this piece this week, I haven't seen it before. I know the pre-order is probably only going to be open a little while longer, as it looks like this is going to actually ship soon.