Hi,
I don't think Image is having selected property, you can use radio button instead and edit its template with the images. So you can select only one image at a time (if your scenario allows multiselect means you may need to use any other controls).
Xaml code will be like this,
<RadioButton x:Name="nature" Height="100" Width="100">
<RadioButton.Template>
<ControlTemplate>
<Image Height="100" Width="100" Source="../Images/images.jpg" HorizontalAlignment="Center"/>
</ControlTemplate>
</RadioButton.Template>
</RadioButton>
And in the behavior of RadioButton, at the Checked event, you can set the SelectedImage property of ViewModel with the radiobutton name. To know about
behavior go to this link.
Hope it helps you.
Regards,
Karuppasamy P