Sophia Loren, at height of her beauty - Power Traced with CorelDRAW X7. A small sample of PowerTrace resources.
The merit of this illustration is not mine, but the PowerTrace resource. In fact its use is very simple. Select the object go to: Bitmap > Outline Trace > Hight Quality Image. In the next window that arises, set the parameters "Detail", "Smooth", etc. until you are satisfied. Click OK. Back to CorelDRAW, drag the new image to the side (vectorized image will come superimposed on the original bitmap). If you see thin white lines inside the vector image, hit the [+] button on the numeric keypad. You will get two overlapping images, but the thin white lines disappear.
Note: Although you double the vector image to eliminate the white edges, the final file size (in KB) will be much smaller than the original bitmap.