JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I am not sure if I have understood your question correctly. Do you want to display your dropbox pictures in your form?
Yes it is possible to show dropbox pictures in your form. Here are the steps to achieve your requirement:
1. Ensure that the image you want to shown in form is shared file in dropbox.
2. Add image field in your form which can be found under "Form Tools" tab.
3. Add the dropbox file URL in the "Image Source" property of the image field:
Hope this helps.
Do get back to us if you have any questions.