This is definitely an improvement.
Arena maps are a challenge to design. People say they want arena rounds to go as quickly as possible, but if a map is too simple, then it doesn't provide a different experience every round. In my opinion, arena maps are a great time to use complicated layouts, with a combination of tight and narrow spaces, and wide spaces. I like to 'get lost' in an arena match, so I can try to stay alive as long as possible.
For your next version, I recommend putting in some buildings. Shall we say six buildings per side? Some of them can join together, and some of them can stand alone. You should try to use these buildings to make it challenging for snipers by blocking their sightlines. That means they should not be able to snipe the enemy's spawn room from theirs. Try to have sniper sightlines of between 1000 and 1500 Hammer units but no further.
It doesn't matter what the buildings look like. You can make whatever you want. If you like some buildings in real life, maybe you could base yours on those. You will probably need to expand the overall size of your map to fit your buildings in. Remember to provide variety in your game play spaces. Basically, that means having some small places, some medium places and some large. In large places, build some cover, such as walls and rocks.