You’re going to get a lot of different feedback.
I usualy look for presentation of what you are strongest at, and what it relates to with current/upcoming projects. If you can show versatility or a specific path you prefer that will provide a better understanding of you, then that is best. I also like to see concept through to final to see your thought process and how to best utilize you in production and specifically how well you can follow through. If you have help (animation, rigging, texturing, etc.), keep that stuff for the end, present yourself and what you do upfront and quickly - just think how many demos the average place gets in a year.
I also suggest making several demos, keyed to specific jobs, just like a resume should be unique for every employer, you are showing the prospective bosses you did your homework on them.
All the best. Oh yeah, nice images, but they could use some work. Peruse many if the students works posted on the forum to get a jump on the critiques. Great start though. 
Welcome.