@im-Amitto, I would suggest following milestones -
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Setup Hello Openemr function that is able to establish link to an instance. From convenience perspective since most platforms have concept of account, it will be great if the login can use that. You can look at hybridauth we implemented on the server side sometime ago. That is currently not in standard codebase.
At the end of this step, user should be able to get basic information. -
Add function to select area (in emr terms document category) and upload an image.
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Add function to send metadata about the image based on whatever local processing available on that device.
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Process image (and optionally the metadata) in emr.
If you want full experience, reach out to local clinics in your community to see if anyone is already / willing to start using openemr and see your code in action. Their feedback will be far more valid than any software mentor.