XAML:
<Image Tag="{Binding Gender}" Width="48" Height="48">
<Image.Style>
<Style TargetType="Image">
<Style.Triggers>
<DataTrigger Binding="{Binding Gender}" Value="Male">
<Setter Property="Source" Value="/Resources/Client_Male.png"/>
</DataTrigger >
<DataTrigger Binding="{Binding Gender}" Value="Female">
<Setter Property="Source" Value="/Resources/Client_Female.png"/>
</DataTrigger >
</Style.Triggers>
</Style>
</Image.Style>
</Image>