You can use the <asp:Image> control, or the plain old HTML img tag.
The trick to binding it to your datasource, is to place the image control inside the ItemTemplate of a Repeater, and bind the Repeater to a list of image URLs which are stored in your database.
The repeater could look like this sample from "ASP.NET Unleashed".
<asp:Repeater
ID="rptImages"
Runat="Server">
<ItemTemplate>
<br>
<asp:Image
ImageURL='<%# Container.DataItem( "image_url" ) %>'
Runat="Server" />
</ItemTemplate>
</asp:Repeater>