You don't need to pre-zoom your art. Post at 1x instead. This forum has a zoom feature, if you click on an image, it zooms in. Ctrl+clicking zooms out.
By contrast I don't mean using more colours, but making some of your existing colours darker or lighter so that they're not all so similar. Example edit of your first version:

This uses the same number of colours as your first version (4 yellows+background/transparency), but the two darker yellows are significantly darker, so that they're actually visible. Notice that I didn't just change the outline, but all the yellows, so that they're all distinct from their neighbouring colours.
I adjusted the shading so that there's no blending, to give you an idea of how it can be done. Doesn't that look much shinier?
I also made a couple of changes to suit my personal tastes: I made the base of the trophy have a perspective more similar to that of the top so that it doesn't look bent, and I modified the outline (lightened it in some parts, eliminated it around the opening of the cup) to give the trophy more volume.