Overall I like it. Its nicely organized with some customisation options that are clearly shown.
Maybe some parts are a little too simple though, especially the “About Us” section, where it’s just the title and a block of text on a neutral gray background. Maybe have a very subtle texture or image in the background to help make it more interesting. Also add the the small underline that’s under the title in all of the other sections.
The header is the most interesting part, mostly because of the photo, and the green overlay adds a bit of depth, which is missing from the rest of the flyer. Everything else is very flat, maybe try having an image under the other green part to help make it less flat. As for the actual photo that’s there, even though it’s just an example photo, be careful how you use it, right now the focus point of the image is right on the guy who looks like he’s either seen a ghost, or is staring into someone’s soul.
The preview is nicely done, but there is a few typos that should be fixed. Even if your first language isn’t English, it’s important that you have no typos and use it properly, otherwise it might come across as unprofessional, seeing as this is an English marketplace.
“Sizewith bleed” - Size with bleed
“Layers Organiced” - Organized Layers
“Strategyc” - Strategic
“Our work is professional to the propoerity of our clients” - (Don’t even know what you’re trying to say) “Propoerity” - Property
“5 colour variation” - 5 colour variations
I think the main problem with the flyer overall is that it’s too flat with not a lot to lead your eye to different sections. Though unfortunately with your item being hard rejected, you won’t be able to just simply make these changes and resubmit, you must instead make a new flyer and try to keep these things in mind when making it.