You are right, both large aperture size and long focal length can increase the bokeh effect. The more distance there is between the subject and the background, the more this effect is amplified as well. :)

I really like the black and white version, it has a nice atmosphere to it! Keep it up. :D

If you happen to have a moment to spare, check out some of my photos as well. I'm new here, but I know my way around my camera, haha.