service tax for computer artists

Hi everyone

I wanted to ask you experts one thing about the service tax. I am a freelancer and a computer artist by profession. I make Architectural 3d animations and stills . I have a degree of bachelors in architecture but i am not practising architecture . I know that architects come under the service tax belt but ia m not doing architecture . i have ventured out into another field. My clients are basically architects and real estate developers who give me the drawings and i generate 3d models for them . Kindly tell me if i come under the service tax belt and do i need to start charginf service tax rom them if my annual gross increases 8 lacs

Thanks