Hrrm.What is the whole point or theme of this BG? MK world is already filled with portals so I dont see way put more. I'm sorry but to tell the truth this is horrible. 1/5 for effort. Cant give hints I still need to work on mine.

Copy & Paste is fun. I mean you dont take into account the green glow, you do not blend anything in and the way the wall suddenly stops looks poor.

You don't seem to listen.

How can you do any of these things in MS Paint?

I didnt realise he used Paint, but other than blending everything else is possible to take into consideration. By Blend i didn't mean the verb "To Blend" I mean the props do not blend in.

Why use the prop with green glow?

Why not make the background the correct size to fit the wall in, or select parts of wall and copy and paste them to the top?

I mean i just made this in 2 minutes on paint and its a lot more errorless.