Hello Umbraco users!

I am having a problem which I haven't been able to solve for days.. I am very new to Umbraco, C# and Visual Studio so forgive me if I don't understand all the terms etc.

My Problem: I have made a portfolio page with inside it a multi node tree picker. The multi node tree picker gets all the portfolio items I have. Inside the portfolio items I have portfolio images (in document types it has the alias "caseImage") Some how I can not get this image to load in the foreach loop.

Code:

    @inherits Umbraco.Web.Mvc.UmbracoTemplatePage<ContentModels.CaseOverview>
    @using ContentModels = Umbraco.Web.PublishedContentModels;
    @{
        Layout = "Master.cshtml";
    }
    <section class="cta-block">
    <div class="container">
        <h2>@Model.Content.GetPropertyValue("ctaBlock")</h2>
        <a href="@CurrentPage.ctaBlockButton.Url">@CurrentPage.ctaBlockButton.Name Formulier <i class="fa fa-arrow-right"></i></a>
    </div>
</section>
<section class="section section section-vertical-padding">
        <div class="container text-center cases-overview-text">


    <h1>@Model.Content.GetPropertyValue("title")</h1>
            <p>@Model.Content.GetPropertyValue("description")</p>
        </div>
        @Html.GetGridHtml(Model.Content, "cases", "cases")
    </section>

    <div class="product-grid">
        @{
            var typedMultiNodeTreePicker = Model.Content.GetPropertyValue<IEnumerable<IPublishedContent>>("featuredCases");
            int i = 0;
            foreach (var item in typedMultiNodeTreePicker)
            {
                <div class="case" onclick='location.href="@item.Url"'>

                    @item.caseImage.Url             

                    <h4 style="text-align: center;">@item.Name</h4>
                    <p>@item.GetPropertyValue("descriptionForCaseOverview")</p>
                </div>
            }
        }
    </div>

It somehow does not recognize the @item.caseImage. What am i doing wrong here? If you need any other info/code just let me know and i'll post it :-).

Hope someone is able to help me :-).

// Daren