The 'forum rules' for selling a car are actually 'guidelines' as to how best to write an ad. These do recommend pictures of course, although they don't require username in them.
The reason for a different approach I would imagine (rules were written prior to my joining) is because anyone that sends money to someone they don't know, to buy a car they've never seen, clearly has problems that any amount of forum rules couldn't possibly help...
(I.e. you are of course going to go and see the thing in person, do the deal and fill in the v5 then)
@Jhyde I do urge you to please read the guidelines however

even before putting up pics, it would be useful to know the year of the car (that would tell people whether it's pre or post facelift) and colour.