Editing an upload and resize function for photo site

I already worked with a coder on this, so? you'll have to take over from where they left off. My client needs to have a stock photo site to upload and sell her pictures.? The picture she uploads need to be resized in 5 different size and? uploaded to the a download folder.? Right now, it does upload and resize but the pictures also are not resizing properly, so we'll have to adjust that.? The width and heith of the pictures will change, so they need to resize accordingly and pay attention if it's portrait or landsacpe. Thank you.