The Golden Idol said:
For the ending, is it possible to keep the aliens as skeletons? The CG alien looked incredibly bad.

Yeah, I've always thought that cutting out all sightings of the CG alien, and instead just having the skeletons encircle Spalko, would be the best scenario. As well as losing poorly executed CGI, I think it would also improve the film's pacing/build-up. With the CG alien removed, it means that the UFO at the finale is the big pay-off, and the one excusable CGI spectacle at the film's end (rather than the otherwise two); also, the UFO wasn't anywhere near as poor looking as the alien was, and I didn't really mind it at all.

Plus, actually showing the alien seemed like overkill; the alien is hinted at in the warehouse at the start of the film, then is practically revealed in the tent (though is still obscured with a blanket, and then shadows, resulting in a more satisfactory and real-looking alien, and also adds some slight mystique). But revealing a fully-fledged and highly-detailed CG alien in close-up at the end was gilding the lilly, I thought, and felt unnecessary.

I'd imagine editing out the CG alien entirely could be tricky, though.