These are intended for more of a VSF (red martians) or Sword & Planet (Krays) setting.
They are based on a mixture of several african building styles, lots of weird and wonderfull alien looking buildings right here on earth imo.
The small domes are incubators for their eggs and the small pointy ones are grain/food storage silos.
When designing buildings for aliens I think you have to ask yourself a few questions like: do they have advanced technology, how do they build, do they spend a lot of time inside or not, do they prefer privacy or communal living, do they use stairs or can they simply jump/climb up and down etc.
That way you get an idea what the overal style is going to be and get more consistency when building more than one or two buildings.
Anyway thats my two cents.
I look forward to seeing what you come up with.
I think there is a definite market for truly alien buildings but the trick will be finding something that appeals to enough different people.
If you like small scale skirmish, check out http://planetares6.blogspot.be/?m=0