I used to use pictures I found online, but I haven't gotten a good one for my "main" character. Originally her alias was Firebug, hence my username, but with how thoroughly I had to remake her to function in 5th editions' neutered technomancer rules, her name is now Lo-Res. I'd change my name on the forum if I could.
The current description for her physical appearance is thus:
"Under all her clothes, Lo-Res is a small and petite pale girl covered in freckles and scars. She has green eyes and messy, short burgundy hair. Her scars are all over, largely covering her torso with a few on her face. One gash through her left eyebrow and a few on her right cheek. Perhaps due to her insecurity, she always wears her polarized-lens motorcycle helmet (with a built-in respirator and sensor array) in public. Even when she's alone she wears it a lot of the time. Clothing-wise she has an electrochromatic urban-explorer jumpsuit that she bought when she got into working as a courier."
In 4e she was a vehicle empath; in 5th she's just kind of shitty at almost everything.