A couple things.
1) Make sure your image control's stretch property is True
2) Trying to size a control larger than its form/container will result in control clipped on right & bottom
3) Size your control to the form's ScaleWidth & ScaleHeight (its inside width/height), not the screen size
4) You may want to use proportional scaling when setting the size of your image control, otherwise it will look stretched out
-- Use VB's ScaleX & ScaleY to get actual image size
Code:
imgW = ScaleX(Image1.Picture.Width, vbHimetric, vbTwips)
imgH = ScaleY(Image1.Picture.Height, vbHimetric, vbTwips)