If you happen to have an option on your camera that has a flower on the left and a initial that says 'MF' on the right, this is an option where you can take real close shots. This is where you will need to use your eyes real perfectly. If you really want the focus real sharp when it's really close, make sure you set up the cm properly. Eg: 3cm, or 10cm. Whichever the cm setup has it's sharpest focusing when it's on supermacro, that's where your focus will become real sharp when it's real close. But if it's a closer a bit but a bit far from the object that is somewhere closer but a bit further, your cm setup will have to be a bit further EG: 20cm, 25cm. If you got the best setup and you think you can get the best close shot ever. Then take the photo. This is one example that's here in dA (Named as: October Observations), check this one out: [link]

If you can't get this right, keep on practicing until you get the best ones out of it.
If you can't get what I just wrote, let me know and I'll fix it up.