A simple way to visualise the path of the ISS while your experiment was running is to plot your photos on a map. You can use a free software application on the Raspberry Pi to do this easily and quickly.
Note: In order for this to work, you should have embedded into the EXIF meta-data of your photo the latitiude and longitude of the ISS at the time the image was captured (this process was described in this section of the Phase 2 guide).
If you saved your latitude/longitude into a CSV file but did not embed the data into the appropriate EXIF fields then you could write some code to do this now.