I wouldn't rely on answers here, simply because it does matter if you can use them. I recommend checking into the restrictions further and being totally certain.
Who are you planning to market to, or hand out your business cards to? That would be a practical consideration for using or not using the images. Are you hoping to land celebrity clients, or focus on sports photography? If not, you might choose other images to represent your talents.
While they are excellent photos when viewed at this size, at business card size, they may not be the "quick read" such a small image needs to provide. The golf ball is likely to get lost among the flying sand, for example. Not everyone likes Travis Tritt's music or knows who he is. The basketball shot may translate well into a smaller form, but the same goes for what people know about Dirk and it may limit how would-be clients perceive your interests and abilities (and you're in Virginia now ... where's that state's basketball team?

). Just some thoughts.