If you don't remember what mode was what for each pic, you can always look at the metadata of each pic on your computer (by clicking the file and looking at properties) and it should display what mode, aperture, shutter and ISO the pic was taken in (among many other things).
Maybe try taking a few in aperture priority (with ISO at 800 or 1600) and play around with a few f-stops from maybe f/5.0 to f/11 whilst adjusting the exposure compensation to see what works best for you given the lighting you have available at the time.
My advice is to just set one focal length (for consistency whilst comparing), pose one figure and then just work with that figure whilst adjusting the settings - once you've figured it out, remember that setting and you will find it works well with every subsequent figure after that.
Lighting is important, but it's not the end all or be all for creating great shots - work with what you have and you can adjust the camera settings to compensate for the lack of lighting.![]()