Personally, I would not accept the services of a client, in lieu of payment.   It could lead to hard feelings or misunderstandings if something were to go wrong.

I also am of the opinion that it is rude to offer a provider any form of payment other than cash.   If she is looking for a website, photo shoots, training, massage, legal help, dental work, auto mechanic work, construction, real estate agent, etc etc etc, she knows where to find that help.   She should be the one to ask you if she knows what you do.  Do not ask her.

Because most of the time barters end up with one giving more than the other usually that other is me.
I'm very low volume & have plenty of RL friends to trade with if I need something. IMHO Its not wise to propose that or ask for discounts to a lady. Idk about others but to me thats kind of a turn off if someone contacts me with a barter or discount request of that nature. You don't want me to be turned off do you? Xoxo Vi.

and I would probably avoid that person.  I agree with the other ladies.  Not cool.

I bought a highschol girl a car, does thast count??

She was 18, but a Sr. in highschool and I met her on livelinks. She rode me RCG in the passanger seat as payment and was open to a few followup visits after that...  (it was an old crappy car on a bargain lot with high miles, but she was fresh and tender, and still had that "new-pussy" smell!