From Adrian Boot's website (Please note: "Images may not be used as a trademark...")
http://www.urbanimage.tv/image_licensing.htmlImage Licensing
Image content in the UrbanImage archive must be licensed before use. Content can be licensed for specific predefined usages, meaning that you must identify how, where and to what extent an image is required to be used.
Usage fees are based on the requested usage. You are typically granted one-time usage rights and must follow UrbanImage's conditions for usage, which are set out below, and are finalized as part of your invoice. You understand that you are not purchasing the image itself, just a license to use an image and you are not allowed to edit or alter images unless authorized.
You must ensure the identification of copyright owner and agency, in such a way that prevents any doubt about such information pertaining to a certain image. Omission of such image and copyright information will incur a surcharge of 100% of the agreed publication fee. UrbanImage will inform you of image and copyright information and it will be stated in your invoice.
When licensing an image from UrbanImage, you understand that there is limited usage of the image. You can also request exclusive rights to a particular image and eliminate simultaneous usage by competitors for a limited time.
Images may be stored locally for a limited time and you must limit access to those persons who are directly involved in creation of the licensed use as set out as part of your invoice. You must also not make images publicly accessible. Following your licensed use, you must cease to use all images and delete/destroy any copies. Images remain the property of UrbanImage and its images suppliers.
Any license granted by UrbanImage is on the condition that you obtain all necessary third-party rights. You agree to provide UrbanImage with proof of all such rights upon request. Images may not be used as a trademark, for unlawful purpose, to defame any person, to infringe on privacy, to break any copyright or trade name of any person or entity.
Unless otherwise specified in writing, your use of images is limited to the specific usage as set out in your invoice. However this license is only granted on your meeting all conditions imposed in this agreement and your invoice, and on UrbanImage receiving all payment within 30 days of you receiving your invoice. Failure to meet these criteria will void any license granted to you and will constitute a violation of copyright law.
The license granted to you is non-transferable: work produced incorporating the image must be for your own use or for the use of your direct employer, client or customer, who must be the end user of your work. Re-selling or re-licensing is not permitted.
On request of UrbanImage, you are obliged to provide free of charge, a copy or access to the work produced by you incorporating the image for our records.
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I would suggest that designers draw their own version of Bob Marley's likeness (but not from a particular photo to avoid any copyright infringement ).