Picture 
Class: Code16\Sharp\Show\Fields\SharpShowPictureField
Configuration 
The picture field has no configuration.
Transformer 
You must value this field with an URL of the image.
If you are using Sharp built-in Upoad solution, be sure to use the SharpUploadModelThumbnailUrlTransformer:
php
function find($id): array
{
    return $this
        ->setCustomTransformer(
            'picture', 
            new SharpUploadModelThumbnailUrlTransformer(600)
        )
        ->transform([...]);
}