yes what turbo dan said is correct. Get rid of your triangles and make them 4 sided n-gons and also, try to make your mesh look even. the more even it looks the better ur results. if u have 2 close edges and then the next edge is far, u will get a irregular bump because its almost af if its trying to make up those edtra edges. The more even spread (Make it look kinda like a grid) it is, the better ur results

Keep up the work, its good to see more car modelers around. This looks like an interesting car so i would like to see how u come along. practice makes perfect so dont give up. good luck mate