How can I display image from external source based on field value ?

For example in <field name="item_id"/> will be a name or number then on the server i'll place a image with specified name.

Already tried to build a widget and it works (partially - gives me a working link (href)) and now i would like to have an image as well.

Or maybe already exist something (custom module) what let me display image from external source ?

I hope you understand what I mean ?

widget="image" but for external source or something like that ?

I already modified a widget="html" to create a links to external sources but it create only a link and display in form.

I can't manage to do the same for images ;(