Okay, here are some criticisms, but try not to take them badly, as I mean not to offend.
Desert Base: Okay, nice use of space, but the base it's self is a bit bland and boring. This is mainly due to the empty interiors, the many studs and the boring walls. Try and add some touches to the architecture, bits that stick out, give it some flavour. You should also look at other people's MOCs of bases to get ideas for what sort of things could go in an interior.
Landing pad Base: Straight away this is much more interesting! Nice colour pattern, and a good start at attempted greebles on the top. Still, the building is mostly just a box, which makes it quite boring. But again, it's a good start, and a good basis from which you could create a truly interesting MOC.