need a method that takes an image and return image within placeholder

Sounds like you will want to create your own custom control. You will probably want to do the using the visual designer but I thought I would give an example of how you might go about doing this.

First the UserControl:

class CustomPictureBoxControl : UserControl
{
    public CustomPictureBoxControl(Image img, int width, int height, Color backgroundColor)
    {
        //you could also use something like 
        //this.Width = img.Width;
        //this.Height = img.Height + checkBox.Height;
        this.Width = width;
        this.Height = height;
        this.Padding = new System.Windows.Forms.Padding(5);
        this.BackColor = backgroundColor;
        PictureBox picBox = new PictureBox();
        //you could also pass the image path as a string
        //i.e. CustomPictureBoxControl(string imgPath)
        //in that case you would use picBox.ImageLocation = imgPath;
        picBox.Image = img;
        //or any of the other PictureBoxSizeModes
        picBox.SizeMode = PictureBoxSizeMode.StretchImage;
        CheckBox checkBox = new CheckBox();
        checkBox.Checked = true;
        checkBox.Text = "Some text if any";
        checkBox.Dock = DockStyle.Top;
        picBox.Dock = DockStyle.Fill;
        this.Controls.Add(checkBox);
        this.Controls.Add(picBox);
    }
}

And an example of how you could use it:

private void Form1_Load(object sender, EventArgs e)
{
    Image img = (Image)new Bitmap("test2.png");
    CustomPictureBoxControl customPicBox = CreateCustomPicBoxControl(img);
    this.Controls.Add(customPicBox);
}

private CustomPictureBoxControl CreateCustomPicBoxControl(Image img)
{
    CustomPictureBoxControl customPicBox = new CustomPictureBoxControl(img, 128, 128, Color.CornflowerBlue);
    return customPicBox;
}

Of course you will need to modify it to your needs. Hope this helps some.