How to show/hide an element in real time (Blazor)?

I have an image I would like to display only after a user has filled in all text fields.

I have tried using disabled attribute, but that does not seem to work. Any other insights?

Here is my current code:

<EditForm EditContext="@EditContext" style="max-width:800px;" onkeydown="javascript: DisableEnterKey();"><FluentValidator /><img src="images/approval-16-grey.ico" alt="Image" disabled="@OkayDisabled"><p class="statp">How many families and/or individuals are living on your land?</p><br /><label class="statlabel" for="amountOfFamilies">Amount of families:</label><br /><InputNumber id="fams" for="indivNum" class="input" @bind-Value="@familyData.IndividualAmount" onwheel="this.blur()" placeholder="Families..." autofocus /><ValidationMessage For="() => familyData.IndividualAmount" /><br /><hr class="statHR" /><label class="statlabel" for="amountOfIndividuals">Amount of single individuals: </label><br /><InputNumber id="individuals" for="famNum" class="input" @bind-Value="@familyData.FamilyAmount" onwheel="this.blur()" placeholder="Individuals..."/><ValidationMessage For="() => familyData.FamilyAmount" /><br /><hr class="statHR" /><label class="statlabel" for="names"> Please enter all of the names here:</label><br /><InputTextArea id="names" class="textArea" rows="4" cols="18" @bind-Value="@PersonName" placeholder="Names of all individuals..." /><ValidationMessage For="() => familyData.PersonName" /></EditForm></div></ul>    @code     {        private EditContext? EditContext;        public FamilyData Model = new FamilyData();        protected string OkayDisabled { get; set; } = "disabled";        protected override void OnInitialized()        {            EditContext = new EditContext(Model);            EditContext.OnFieldChanged += EditContext_OnFieldChanged;            base.OnInitialized();        }        protected override void OnAfterRender(bool firstRender)        {            base.OnAfterRender(firstRender);            SetOkDisabledStatus();        }        private void EditContext_OnFieldChanged(object? sender, FieldChangedEventArgs e)        {            SetOkDisabledStatus();        }        private void SetOkDisabledStatus()        {            if(EditContext.Validate())            {                OkayDisabled = null;            }            else            {                OkayDisabled = "disabled";            }        }    }