Bevel
Excellent composition. A few points of constructive criticism:
- Bevel the edges: plastic tools don't have such sharp angles.
- The IOR on your glass objects generally seems too high. Why, for example, is there a black line on the upper edge of the syringes?
- Specularity: the glass and needle need a sharper, more pronounced specularity, while the plastic needs almost no specularity.
- Your main light is in the upper-left behind the syringes, correct? Add another, half-energy light in the lower-right to fill out the shadows on the plungers.