Foot fetish is very individual from what i have seen/heard. But in general i belive that most of us with a foot fetish would be happy to just see nicely shaped female feet either bare, in nylons or heels incorperated in the games.
There are so many specifics an individual get off on his/hers foot fetish. Some like unpainted toenails others dont. Some preffer larger feet while others like small ones. Some like to sniff, some like to kiss and lick. Others might be happy with just looking at the shape of a foot.
There are those who like dirty feet or seeing barefeet crushing food under their soles. Some get off on urinating on feet. Some men get off on cumming in high heels and have their parter wearing the shoes right after with barefeet or in nylons. Then there are specifics as just having a fetish for certiain parts of feet, like the toes, soles, heel or arches. Its a damn rabbithole that you can dive very deep into.
If i would develop a game containing foot fetish I would stick to the basic stuff. Gettin the texture and shape of the foot/feet as realistic as possible. Classic poses and not having too many close ups. If i then also would want to add nylons and heels then these also have to look the part, as realistic as possible.
On a personal level. I have a weakness for small female feet (size 5-7) that are well taken care of. Females with tattoos on their feet are automatically disqualified. For me that is like putting a sticker on a piece of art.
I have never considered my foot fetish to be a dominant or a submissive behaviour. For me it might be just a bit of naughty foreplay, part of seducing my partner. When im in a steady relationship, the foot fetish part gets more attention with all kinds of foot play. Not all females are into having their feet massaged,kissed or go as far as giving a footjob and then licking the cum of their feet, or whatever. But yeah, i do get more sexually aroused by a nice pair of feet than a pair of breasts.
