There's not much to think about. It's clean, readable, and your isometric shapes look correct (if the tiles are intended to be cubes, they're too flat though).
However, there's also nothing interesting about it. It looks like an ideal/mathematical representation of a chess board, which is fine if that's your goal. If you want it to look like a physical chess board not not an abstract one, you'll need to push the details. For example, perhaps the black and white squares could have small gutters between them instead of just being perfectly flat - how might you go about pixelling that? Perhaps the wooden(?) edge around the playing area would have a texture to it, and it probably wouldn't be segmented. The corners probably wouldn't be perfectly sharp. Little details like that make an object feel more real, and look more interesting. But again - that's only if those are your goals.
Agreed. It's just identical blocks of 3 different colors with nothing else to catch your attention.