Hello! I have just seen the other GFX, and this one, theres a big difference (good and bad). Let me explain everything what can go better and some tips you can take to the next time.
What I think the lightning doesnt match, You can change a light color by selecting the light and then go to the properties tab and scroll down until you see the lightning logo. then you can change the colors, white would fit.
The background looks grey and boring, you can maybe change the colors. If you want to do that you go to properties and then go to the world properties with the planet icon, select it and then u can change the colors.
Fun fact, my first GFX literally looked like that. Here is how it looked like: