There are other "sort by" or "group by" options. It may or may not give you what you want.
While in your pictures folder press the Alt key. Now you should see another toolbar at the top. Click on View to see more options. Also notice the "More" option at the bottom after you select sort by.
Short of that the only thing I can think of is to rename the pictures. Possibly by adding a number or letter at the beginning. apic1, bpic13, cpic42 or 1pic1, 2pic17 etc.