It just doesn't look like any sort of cannon/tower. Working without reference or concept can leave your models looking really bland. I mean something like this looks more like a toxic cannon, if you just change the light to look more like a toxic cannon. Try to do some research and come up with a design you like before you…
Hey all, brand new here! I've been working on a small game with a friend of mine... gonna be updating this thread as and when things get finished... CANNON is first! C&C need please! A-thank-ye-very-much 4132 polys 2X 1024 diffuse maps
I haven't attempted weapons much, so I have a tonne of development room. But here's a magic-based projectile weapon from a dungeon crawler a friend and I are working on ^.^ Artstation page for it : https://www.artstation.com/artwork/sahmbani-rifle-mana-cannon-roldan-weapons
Your cannon is missing the trunnions and the mounting brackets. If you look closely at the reference, you'll notice that the verdigris is much heavier on the top of the cannon, and falls off sharply below the mid-point as the metal curves in. You're also missing the inscriptions & the equestrian.
Here is the progress I have so far on the Auto Cannon from Elite Dangerous, any critique or tips would be much appreciated. I am using 3DsMax for modeling and am going to use Substance Painter for textures. Concept: So far: Close up: