Photo one is a great location, reminds me of a side room for the "new" enterprise, lighting is good, white balance is off a little though.
Photo two is a little busy in the background, might be better to be closer to her or bluring out the background a little more.
Photo three is wonderful and reminds me of the planet visited in the "second" of the new series.
photo four is my favorite with the way the arches make the starfleet logo
photo five is good, but it just seems too far away. maybe cropping a little closer to reduce the head room and legg room.
overall, nice job! I would recomend checking out the student liscenses for photoshop / lightroom (which ever you prefer) when you have the funds, I use both and they are amazing, especially when you get a chance to shoot in RAW format. A lot of this reminds me of my earlier work from 2007 actually.