Close-up photos are very impressive with their own detail and sharpness. If you shoot flowers or insects you will see beautiful colors. To capture this kind of photos you need special macro lens, but often times the regular digital cameras has macro option. The result is not so professional like professional lens, but it is good enough to make some impressive pictures.
When you shoot in macro mode the camera changes the focus distance between camera and the subject. A close-up photo has very small area of focus – only a few millimeters. Getting in close to capture all the detail of a small object is nearly impossible with the regular setting on a camera.
Try to shoot in this mode. Experiment with what you want. There is a main problem in this shooting style – a light. To have very sharp pictures and in a focus you need to shoot with very close diaphragm. This lead to dark photo, but if you use a flash or some other source of light you will achieve very good results.
If you want you can sell online some of the macro photos. You can take close-up photos of such objects as stamps and coins, show the engraving on an object or allow a viewer to see that a piece of jewelry is flawless.
Go for a walk, explore and take pictures all the time. Start to see a little things around you. The difference between professionalism and amateur is in little details. A professionalism give efforts to make things perfectly, otherwise the amateur is not so good in this. Keep shooting in macro mode, this will develop your sense of shooting an will bring you to the top of your photography work.