Dithering is unnecessary and flattens the piece: remove it! You could use anti-aliasing instead. Contrast is too low.
There is some banding, esp in the lower parts of the cars.
I'd suggest making a larger canvas with the same car size, so they might be a little more distant, as it is the back one looks weirdly bigger (typical iso problem). It would also make a better composition.
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Well done for a start.
Dithering is unnecessary and flattens the piece: remove it! You could use anti-aliasing instead. Contrast is too low.
There is some banding, esp in the lower parts of the cars.
I'd suggest making a larger canvas with the same car size, so they might be a little more distant, as it is the back one looks weirdly bigger (typical iso problem). It would also make a better composition.