Depending on the type of photo, there are a few ways to convert a photo to a line drawing. One is to use the trace feature to convert the photo to a drawing by first selecting the dropdown Bitmaps>Mode>Black and White 1 Bit, then select the conversion method Ordered and adjust the black and white. Once this is complete, select the Trace Bitmap feature to convert the file to a line drawing; this process takes a lot of computer processing power.
Another option that works better is to use the free Adobe Capture app for both Android and Apple phones and tablets; this app takes any photo that is taken or downloaded and converts them to a vector format or line drawing in seconds. Once the image is complete, the app then allows the image to be exported as a .SVG or PDF vector format (line drawing) that can then be imported into CorelDRAW.