I think your next step is to start to consider how a portfolio is put together. We have plenty of images here and your technique is delivering credible results. Do they all belong in the portfolio? What would be the guiding criteria for selecting images that belong? What is the portfolio about subject wise? Why would the viewer want to spend time with your portfolio? What are the aspects of the portfolio that your images will communicate to the viewer? How can you strengthen the content? What are the strongest images? What are the weakest images? For your portfolio is there a story line or is this a documentary? Is this collection a part of a larger portfolio of images?
I think you are on to something concerning all images being of the same magnification. Perhaps you want to capture a collection of images based on different magnification ratios showing the creature in several different scales from different angles. That's a good starting point to put these images into the context of a showing.
A portfolio is in essence a show hanging on a wall in a gallery.