This drawing of megaman could use a background behind him.

Perhaps a futuristic city with lights, roads, buildings, ect.

You can perhaps practice drawing both megaman and the futuristic city by looking into some more reference material.

You can look at real life objectss, other cartoons, videogames, anime, ect

Borrow influences from many of these sources and than build upon them.

Your already your own art style but just need a bit of refinement.

I look forward to seeing more work from you.