Few pointers to learn:
1) Concept boards should be concepts, no need for computer renderings. Hand renderings, exploration of internal thought processes, hand annotations (neat) and exploratory renderings are much more appreciated.
2) If you want to get ahead, on any project, think through every single detail, even if it is only concept stage, that way you'll get the most thorough feedback concerning the viability of your concepts
3) At this point in time, it's all about the process, and a good portion on the finished product and rationale, but mainly the process.