Before investing in 3d Face generating programs, determine which model you will use as a base and research if these programs are adequate for your needs.  There may be a steep learning curve or the model you would like to use is incompatible with the software.  

Also, consider copyright laws and how those apply to your particular situation.  Friends who freely grant you permission may be fine, but celebrities or individuals unfamiliar with you may object to any representation in a 3D Image.