1.Choose only finished pieces of work for your portfolio. Leave your unfinished work for the next go round of portfolio submissions.
2.Limit the amount of work that you are showing to no more than 20 pieces.
3.Organize your work according to style or subject,
4.Sow your strongest works first.It creates a good impression.
5.Ask an unbiased person who has good knowledge of art to assist you as most people are not good judges when it comes to their own work.
I hope these tips will help you making your portfolio.All the best.