Sorry for the lateness of the reply, been traveling for work, but it looks like Marcus gave you some good information. He is the small and tiny prints expert! I just wanted to put out some other numbers for you to look at as other people have thought of trying to do a small side business producing customized busts or statues. If you do scan a head as Marcus says and print just that item, a head that is approximately 28 cm will be scaled down to around 13 cm tall to fit the printer. To give an idea of feature resolution this means that a nose that is around 4.3 cm in length would shrink down to about 2 cm. I think feature definition for this size is definitely possible for this printer and would be recognizable. Looking at Thingiverse, I downloaded this model:http://www.thingiverse.com/thing:10836
and ran a print preview of it, I did not actually print it. Looking at it in the UP software and using .2mm layers and fine resolution with loosest fill, the software says it would take 55 g of ABS to print and 6 hours 44 minutes to complete the job. It looks like the model is scaled to about 13 cm tall but I did not really check the quality of the model. You could hollow out the model to reduce the amount of ABS needed, but with a "hollow head" it would probably take the same amount of time to do because the model would now need support on the inside.
If you tried to scale a whole person down, I don't think the resolution is high enough for you to recognize them after it is printed. For a person who is 180 cm tall with a nose feature of 4.3 cm (again with the nose, not sure why, and that isn't my nose size, it just seems average!!! : ) ), it you scale that down so your statue is 13 cm tall, the nose feature shrinks to just 3.1 mm, or just over 15 printed layers at .2 mm resolution; a 28 cm tall head would only print out 2 cm tall.
I did not have a person model to see how long or how much ABS would be needed but I think you get the idea from above.
Not trying to scare you off, just to be aware how long some of the models take to print at what a realistic model will look like. I love my printer and it is amazing for the things I print, work models here at the office, prototypes for people before they have tooling made, fit check parts, etc. It has never let me down.
As to software, I use Solidworks, but this is a package that is a pricey overkill for most people. I use it at work and got a deal on it so I stick with it. I don't think there is anything I wouldn't be able to model with it, but I also know people have been creating amazing models with the freeware packages that are available. I am trying to learn how to use some of these myself to be in a position to help friends who are interested in 3D printing but won't be able to go the Solidworks route.
Sorry for the long post, hope it helps. Good luck!