Try learning how to make/model your own background :3
The lighting also seems quite bland/hard light in both of the images, it makes the image looks pretty flat. I also suggest that you learn about composition. Gl on your journey
I’m amazed how pro GFX artists could create wonderful and awesome looking effects in their GFXs, great job! About the second picture, I would suggest you to add a red lighting behind the character to make the “flame” ( or whatever that is ) more suitable for the GFX.