Custom field image / admin plugin

Hi, I’m making gallery tab using list and filepicker fields, its working pretty good, but after save the input field with selected image shows just the filename, and not image itself. I have preview_images turned on in my blueprint. Dont u know what should do the trick to show selected image easily?

here’s part of my blueprint

            header.image:
              name: image
              type: list
              style: vertical
              label: Galerie
              limit: 7
              fields:
                .text:
                  type: text
                  label: Popisek
                .picked_image:
                  type: filepicker
                  folder: '@self/gallery/'
                  label: 'Vyberte si obrázek.'
                  preview_images: true
                  acccept:
                    - 'image/*'
            .upload: 
              type: file 
              label: 'Nahrát nový obrázek' 
              destination: '@self/gallery/'
              multiple: false
              accept:
                - image/*

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is it possible to have thumbnail visible in selected option? i mean ilu09
Screen Shot 2016-12-03 at 01