First images looks to me not a vector. Second might be a vector but I don't have any idea how you rendered that thing. None the less if its yet another JPG, it must have perfect sharp edges especially if you zoom in at 100 percent. If fuzzy when zoomed in, its back to the drawing board and that 3D graphic must be rendered at a higher dpi so you can have those smooth edges at 100 percent. Otherwise must be made into a true vector with a vector program. That's just how it is. If you can't afford Illustrator in any form, just get a free knock off till you can afford one. And no you can't make a true vector in Photoshop. 🙂
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