A ruler is a must. I have no idea of the size of the comparison figures, so they are not helpful to me.
Someone, either you, or a similar KS vendor, discussed judging figures by their base size: base sizes vary, and unless they tell the viewer the size of the bases shown in the photos, up front, we have no way of knowing the size of the pictured base. Even if I did know the size of the base, it is still a guess on my part.
A ruler is just so simple, and easy to use -- no guesswork, no estimating, no need for me to pull out my ruler, measure the size of the base on my screen, and compare that to the size of the figure, on my monitor…
A vertical ruler next to the figure, is the only thing I need in order to judge them by. Much appreciated. Cheers!