They are beautiful and they are very surreal. They have great READ-ability.
Beauty inst necessarily what you want in matte paintings.. If I had hired you for these I would expect more blending of the elements... the skies look particularly un connected to the image if you know what I mean.. Again, if I was PAYING for these Id suggest some gradients overlaid on the sky to darken it as it nears the horizon, and add haze to the distant objects... but that's just me.
You know, you could probably find someone here to donate some footage for you to do a specific matte painting for. Or I know that videocopilot set extension tutorial comes with some footage that can be used for live footage for your matte painting..
Thanks