Interesting… I have a vested interested in community gardens and pocket parks. I like them. So soft spot. But I do not submit unless I know it can pass. This looks at first glance to be a very hard sell.
Evidence evidence evidence. If your local council has documentation that this is an open space for community gathering and will be used as a community garden (which to many many people means a place where people grow veggies etc) then your “sale” of this is difficult. Even community website that talks about it.
Quality quality and quality. Title, text, photos, supporting. I would not use the word community with the word garden. In fact an Italian word springs to mind. It is a piazza. A hard covered ground area surrounded by buildings. Though in the UK that would tend to be a “square” but they tend not to be square!
I think the US (correct if wrong) may use the word plaza. This is not a classic one of those - and we need to be careful as many people may think of these places Plaza De Armas, Trafalgar Square, Convent Garden, Potsdamer Platz or Times Square.
The key point of these is that they are (whatever the size) - most often a focal point of a place where transport lines meet. That could be argued here 
I would work photo. Try and take on phone not in game and look around how it might work. I often take them first, crop / centre then load photo when creating nomination. But you have houses and cars on all sides here. Supporting photo is pretty similar to the main photo so that might put people off. And the sun is blurring out part of the photo
Claiming something could be used to socialise by X number of people is not the same as evidence they do socialise. At best, to me, it is a place to explore .Providing a space of community to gather and exercise while walking in their community. But be aware many people who see this in street view will see a spot of 3 benches and where 3 paths meet
New builds are tough!!! Notorious in any area for creating the community elements post build if they build at all. This includes playgrounds to fitness stations, trails, nature spots etc.
Which is why a lot of people get together and write to council asking where are all the community facilities from walking trails to fitness stations. Always worth poking them!
I agree with Hankwolfman. Anyone can add comments/language to google maps etc. I have seen many local parks renamed on google that do not use their official name! Where someone has gone in and called it so and so close reserve and the other end is called so so road park but the official name is something else. So I now treat map names with suspicion. And I always say get the official word/evidence from council etc
I am not trying to put you off @C3stM0i64 . Just pointing out that some nominations need more work than others. This may be one of those.
Are there any other Points of interest near by. Cafes, hiking paths, playgrounds etc. I E the low hanging fruit that you can nail?
Good luck.