Rhonda, A good lens on that 100d super and you will be snapping shots better than those in no time. I kind of agree with Audio bomber about the 50mm not being your only lens, it is a great lens but I dont know that I would choose it as my only lens. I can imagine if you do you will get really good with it fast though. One of the problems I had and still have is that I buy the next lens before I truly get the best out of the one before it. LBA!
Mine FA 50 does not get used much since I got my 28-75, but these two are from the first night I got the FA 50.... taken at work in funky indoor dark lighting.... Looking at them makes me want to throw it on the camera right now!
And an outdoor shot of The Menace
As Stu pointed out... the old M and A manual focus versions of the 50mm lenses are really good too. My SMC Tak 50 1.4 is my fave of my 50's... The M or A versions of the 50 1.7 are really nice lenses too, and can be found fairly cheap.
Now are you thoroughly confused? haha