Thinking a little outside the square here:

Think of your form as an HTML page (assuming that somewhere along the track you've designed web pages...) You would show a thumbnail as your image, then when the user clicks/dbl clicks on the image, it magically enlarges.

Applying the same technique to your VB program, you could have a non-resizeable image created as a thumbnail, stored as an extra field (or create a new table for thumbnails), and provide that to the user.

The problem comes in when you try to resize an image either much smaller, or much larger than its original size....the pixels are calculated according to a particular formula, which gets less and less accurate the further away (in size) from the original size that you get. You could perhaps be able to use the kodak image control to resize the images to the user-defined size - but it could be a little bit clunky.

Good luck