They do look pretty close, especially the Electra. Try sewing some heavier fabric, and see if that helps. It also looks like you're using a pretty unforgiving fabric there; try some quilting cotton or denim, and it will likely look better.
Can you see dots of the top thread on the bottom as well? If so, the fabric is just too thin to hide the stitch.
Those are beautiful machines, btw! I especially like the Electra (Necchi?). It looks like it does a small handful of utility stitches, then embroidered swans and tulips? What a great combination of stitches!