Nice Designs bro... but if u really wanna take them to a modification shop atleast they would ask u to show them something from every angle.... e.g side view, front view etc... u know wht i mean.... they would ask for Rendering... because the sketches u posted... sorry to say bro but this is wht like almost everyone does in spare time.... its not about designing.... anyone can design a bumper... its about how u represent ur stuff... and if u wanna go on further wid it and wanna bring them into reality.. the sketches above wont help u... u would need something more professional..
Dont take me wrong. but if u wanna go on further and wanna bring them into production u will need to work more hard and it will take time for u to make something more professional.