Hi Dibs,

With this code below you should get what you are after.

    @inherits Umbraco.Web.Macros.PartialViewMacroPage


    @*    
        How it works:
            - Confirm the macro parameter has been passed in with a value
            - Display any individual image

        Macro Parameters To Create, for this macro to work:
        Alias:mediaId     Name:Select folder with images    Type:Single Media Picker
    *@

    @{ var mediaId = Model.MacroParameters["mediaId"]; }
    @if (mediaId != null)
    {
        @* Get the media item associated with the id passed in *@
        var media = Umbraco.TypedMedia(mediaId);
        <img src="@media.GetPropertyValue("umbracoFile")" alt="@media.GetPropertyValue("Name")" />

 }

Remember to add the parameter to the marco, and the important thing here is the alias of the parameter.

Hope this helps,

/Dennis