There are different types of religions that would use different types of posters to pass out the information that they intended to say. The Buddhist would generally go for Buddha statues that stand out in order to avoid confusion with the rest of the religions that also have their posters all over. This means that an individual intending to place a poster with Buddha statues he/she should be able to differentiate them with other religions e.g. Hindu that have got almost similar statues. There are mainly two ways in which you can have your posters presented i.e. using canvas print or framed art. Both ways are mostly used in a poster as they have the appealing effect on the poster that we use.
The Buddha statues that are in the posters should be original. There is no need to use the Buddha statues that are mere copies of the originals. This would be lowering the values of your posters hence rendering the info being passed out to be of no importance.
You should keep in mind that the posters and art prints that you are placing are more or less religious based and thus should be of high quality and the info involved should also not go beyond the religious boundaries. The image that you intend to be derived by the public should also be within you as you create your posters. With this in mind you will not be far off from you target at hand.