Drawing overlay on bitmap in pipeline

using (var reader = ImageReader.Create(fileInput))
using (var overlay = ImageReader.Create(fileOverlay))
using (var crop = new Crop())
using (var resize = new Resize(3000, 2000, ResizeInterpolationMode.Lanczos))
using (var sharpen = new Sharpen(V.sharpnessValue))
using (var contrast = new Contrast() { Auto = true })
using (var drawer = new Aurigma.GraphicsMill.AdvancedDrawing.Drawer())
using (var writer = ImageWriter.Create(fileOutput))
{
    crop.OnInit += (sender, e) =>
    {
        var cropRectangle = MakeCropRectangle(sender, e);
        (sender as Crop).Rectangle = Rectangle.Round(cropRectangle);
    };

    drawer.Draw += delegate (object sender, DrawEventArgs e)
    {
        e.Graphics.DrawImage( ??? );
    };

    var pipeline = new Pipeline();

    pipeline.Add(reader);
    if (V.isCrop) pipeline.Add(crop);
    if (V.isSharpness) pipeline.Add(sharpen);
    pipeline.Add(resize);
    if (V.isAutoCorrect) pipeline.Add(contrast);
    pipeline.Add(drawer);
    pipeline.Add(writer);

    pipeline.Run();
}