Need Help In modelling (Beginner)

I am tying to make Grumobile from this reference pic. This is the model I am working on. Please tell me is there any way to make these metal rivets other then making and placing them individually. secondly in PIC 1 the exhaust part have a sharp edge on top because of mirror modifier, is there any way to make it smoother. Third (Material related) how to give the surface those scratches ,surface imperfections and the Gru Logo.
Thanks in advance.:eek:

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copy an edge loop, subsurf it to the correct density, extrude it a little ( into a face loop ), and use duplifaces.

Yes. One way is to use procedural duplication to distribute them. Dupliverts with vertices and edges, or dupliframes with curves.

Yes. Find out what causes the sharp edge, fix it, and have mirror merge them properly. Looks like it could be because of inverted normals, caused by something in your file.

Light it, make material reflective, have something to reflect, and then use textures to control the material properties for color, reflectivity/roughness, and the surface directions with displacement/bump/normal maps. Bump map might be enough.

Thanks JA12 i will try to implement the solutions suggested by you.