Good practices for uploading images through a restful API

I'm using Amazon S3 in my restful service to upload images. The restful service is being accessed by a iPhone app. I'm trying to figure what will be the best approach to upload the images.

Option 1: Use a multipart form data to upload the image and also include the JSON itself as another multipart in the HTTP request.

Option 2: a. Upload the image directly to Amazon S3 and get the URL back. b. Send a restful request with the JSON including the image URL.

Which approach would you choose?

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I go for Option 1 as it is one request. It is better than 2 separate round trips (in Option 2).

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