Some tips for you:
1. If you have a tripod, use it - that would help a lot in making your shots free from camera shake.
2. I'll shoot indoors if I can, against a nice or plain background (I'm assuming you're shooting indoors).
3. Select a time of day where nice sunlight comes into your room. Do not put your doll right in the sunlight, but in a spot where there is no direct sunlight. The idea is to get sufficient light, yet not harsh light.
4. Using ISO 200 (or the lowest ISO setting is good), however, that is the reason why we need lots of light (point (3) above).
5. Macro mode is correct too - especially if you are placing your camera near to your doll.
6. Do not use flash - the only time where flash can be used indoors with good results for doll photography is if you have a powerful enough flash that can be diffused with softboxes, or a flash that can be bounced on the ceiling. A compact camera usually is not able to achieve both. Hence Ill stick to bright sunlight times.
It would be useful if you could post some sample photos you have taken and reasons why you think they are not good (I'm assuming you think they are not good that's why you're asking for tips on how to make them better).
It would be easier to advise you on what to try next if such examples are available.