The product name already appears to be there.  It sounds like you want to show an image along with the name.  Here's a snippet replacement that can help you get there.  It's untested, but it should get you where you need to be.  Note the additional method, and the image added to the HTML. 
  
 [CODE]@model Hotcakes.Modules.Core.Models.SideMenuViewModel

@functions{

    string GetProductImage(string url)
    {
        // get an instance of the Hotcakes application
        var hccApp = Hotcakes.Commerce.HotcakesApplication.Current;
        // create a cache key
        var current = DotNetNuke.Entities.Portals.PortalController.Instance.GetCurrentPortalSettings();
        var cacheKey = string.Concat("HccTop10", current.ActiveTab);

        // see if the products are already cached
        var cachedItems = DotNetNuke.Services.Cache.CachingProvider.Instance().GetItem(cacheKey);

        if (cachedItems == null)
        {
            // load the products from a query only if a cached collection doesn't already exist
            var s = new DateTime(1900, 1, 1);
            var e = new DateTime(3000, 12, 31);
            cachedItems = hccApp.ReportingTopSellersByDate(s, e, 10);

            // cache the products to prevent performance issues
            DotNetNuke.Services.Cache.CachingProvider.Instance().Insert(cacheKey, cachedItems);
        }

        // convet the cached products to a usable list
        var products = (List) cachedItems;

        // iterate through each of the 10 products in the collection
        foreach (var product in products)
        {
            if (Hotcakes.Commerce.Utilities.UrlRewriter.BuildUrlForProduct(product) == url)
            {
                // return the product image only if the URL's match
                return product.ImageFileMedium;
            }
        }

        // return a generic image, in the event that there isn't a matching product image/URL
        return "/Portals/0/some-folder/generic-image.png";
    }

}
<div class="hc-top-10-products">
    <h2>@Model.Title</h2>
    <ol>
        @foreach (var item in Model.Items)
        {
            <li><a href="@item.Url" title="@item.Title">
                <img src="@GetProductImage(item.Url)" alt=""/><br />@item.Name
            </a></li>
        }
    </ol>
</div>