Maybe you vectorised some parts of the bike when you modified it from another picture. Like the front and where it connects with the sides, you can see the red tone difference.

All the rest is a photo, the way the light reflects and where you can see the pixelation of the picture due to the low quality of the file here https://imgur.com/a/mwkxtUH and here https://imgur.com/a/mwkxtUH shows that it's not a vectorised illustration at all.

You can be good as you want in digital illustration (and probably you are not) but there is no chance that you can make a vector illustration good as a photo.

You can achieve very very good results with rendering, but to make a render that is realistic as photo you need to be basically a genius.