Natural light is important. So take the photo outside or near a window is best.
Think about the pose. What pose do you want your character to be in? standing or sitting? hands on hips? yoga pose?
What items do you use for work? If you have specialised equipment it can help to make your character relatable.
Favourite piece of clothing/jewellery/accessories . You can have your favourite outfit. It’s as easy as sending me pictures and letting me know how they’re worn.