Have you decided on the type of a mobile app you are going to create? There are a couple of samples that demonstrate how to capture an image from a mobile device and send it to the backend system as well as how to show an image on the mobile device that was sent from a backend system.
They are using SUP Mobile Workflow designer with SUP 2.1.3 to create an HTML container based application.
The samples are available on the SUP Apps site https://cw.sdn.sap.com/cw/groups/sup-apps
In particular have a look at the section called Accessing the Camera in the Expense Tracking Sample https://cw.sdn.sap.com/cw/docs/DOC-148193
and
Using the PhoneGap API to Take a Smaller Picture in PhoneGap and Hybrid Web Container Customization Sample for 2.1 ESD #3 https://cw.sdn.sap.com/cw/docs/DOC-149428