It's all context-dependent, something you learn best by doing. My advice is to try forcing yourself to stick to a lower resolution, and fix the problems you see. You will learn how to minimize repetitive features in a texture that is tiled. You will also learn how to leverage vertex blending and other techniques like…
In this context I'd absolutely encourage investigating ways to reduce tiling with small textures as Eric suggests. learning these techniques pays off in all sorts of ways (i recommend mocking it up in photoshop/designer, then figuring out the maths later btw). but That particular example.. not sure I'd recommend it…