I see. So you are rendering a list of HolidayPackage content items. This list is typically rendered using the "Summary" display type, so what you could do is add a
<Place Fields_MediaPicker-Thumbnail="-" /> <!-- This is an example, you have to use real shape names here. The "-" indicates that the shape should not be rendered -->
to Placement.info of your theme or module.
Inside of that match element, add <Place /> elements to specify where and if a field shape should be rendered.
(I'm assuming you're working with content fields)
Alternatively, you can override the entire content shape of the HolidayPackage type for the Summary display mode:
In there, you can access all the parts and fields of the content item.
As a final note, you may want to consider using Projections over Lists, since Lists are deprecated and Projections can do the same, but have more flexibility, options and power, should you need it.