OX-CORP Scout Drone - Concept Render

Realistic rendering is something that I'm always trying to get better at, since its fun blending digital and real together, so I saw a still frame from "District 9", and wanted to see if I could achieve a similar look, but with my own style, while taking inspiration from that image, which resulted in me created this. This was probably the most complex mesh that I have created to this date, and texturing it pushed my computer to its limits, with multi-layered textures in Substance Painter. Overall I think I got close with a realistic render, but let me know what you think I could do to make it even better :)