that should be fine, unless one of the sites require exclusive RM images (I don't know about photoshelter or inmagine)

You have to be careful though, if an images sells on one site giving exclusive coverage for a country, for example, you have to make sure and change the image on the other sites showing that it is not available in that country anymore.

Thanks Leaf, Fran.
well, sure the point is exclusivity. In fact, I don't want give any exclusivity on these images, but only sell them as RM, so they can be at different agencies.
- In PS policies its written : "You can list images here non-exclusively", so, I think there is no problem with them.
- In inmagine policies, it's written : "Under this contract the Contributor has the right to: control whether each Image they submit is sold under a Royalty Free or Rights Managed License (with or without Rights Protection)." I think there is also no problem there, since you can control Rights protection.
- At Alamy, Licenced images can also be, at your choice, Rights Protected (i.e. exclusive) or not either.

Well, seems to be there is no problem there. But about FP? any advice? (since I never put RM images there).

It's quite hard for me to get all the nuances of the legal texts, since english in not my mother tongue.

Thank you much RT for your light, you are right, they don't play on the same market.
Btw, Alamy also sells images for $1 now with their new "Limited Use"...