need to change the image to more transparent.

// Thumbnail-size image
Byte[] byteBLOBData = new Byte[0];
byteBLOBData = (byte[])dReader["p_Image"];
ImageExtension = dReader["p_Type"].ToString();
MemoryStream stmBLOBData = new MemoryStream(byteBLOBData);
stmBLOBData.Write(byteBLOBData, 0, byteBLOBData.Length);
System.Drawing.Image returnImage = System.Drawing.Image.FromStream(stmBLOBData, false, false);
System.Drawing.Image cropImage = ImageHandler.ImageCrop(returnImage, 100, 160, ImageHandler.AnchorPosition.Bottom);

//define a string of text to use as the Copyright message
//string Copyright = "Copyright © 2011 - OmegaLove.com";
//add fading to logo image  using TextureBrush
System.Drawing.Image waterMarkimage = System.Drawing.Image.FromFile (
    (System.Web.HttpContext.Current.Server.MapPath("~/Images/Watermark/watermark.jpg")));

Color color = System.Drawing.Color.FromArgb(50, 0, 0, 0);

Graphics opacity = System.Drawing.Graphics.FromImage(waterMarkimage);

Rectangle imageRect = new Rectangle(0, 0, waterMarkimage.Width,  waterMarkimage.Height);
Brush brush = new TextureBrush(waterMarkimage, imageRect);
opacity.FillRectangle(brush, imageRect);
opacity.Save();
Graphics g = System.Drawing.Graphics.FromImage(cropImage);
Point point = new Point(cropImage.Width / 3, cropImage.Height / 2);
g.DrawImage(waterMarkimage, point);