For news and events content items you can't use the built in GetRelatedItems or anything like you would with a Dynamic Content Item. Instead you have to do this to get a related item, this is for an Image (in cshtml):
@model Telerik.Sitefinity.Frontend.Mvc.Models.ContentDetailsViewModel
@using Telerik.Sitefinity.Libraries.Model
@{
var image = (Image)Model.Item.Fields.YourImageFieldName.DataItem
}
<img src="image.ResolveMediaUrl" alt="image.AlternativeText">