Easiest way to make a graphical abstract is using Microsoft powerpoint or paint. You simply merge into one figure a small number of diagrams that give an overview of your research. You then save the file as a single image and resize to the dimensions specified by the publisher. To see examples, I would suggest looking at a journal that requires graphical abstracts for publication e.g. Phytochemistry
In which u have to explain your finding with brief words with diagrams. The graph or Diagram is the tool for your explanation. kindly find the link and see how they explained concisely.
You can draw on any software eg on power point / corel draw / Photoshop and then save it as a image file. Use concise and to the point words and illustrative figures / diagrams to explain your article in the form of graphical abstract. For example your plant, its extract , bioactivity figures etc.
You can read articles having graphical abstract to have an idea.
Easiest way to make a graphical abstract is using Microsoft powerpoint or paint. You simply merge into one figure a small number of diagrams that give an overview of your research. You then save the file as a single image and resize to the dimensions specified by the publisher. To see examples, I would suggest looking at a journal that requires graphical abstracts for publication e.g. Phytochemistry
In graphical abstract we generally show the theoritical abstract in graphic form. I recommend you to go through the latest issues of Journal of Ethnopharmacology for more clearification.