I can make small pieces pretty well, because they don't really need a texture, or in the worst case it's just 2-3 pixels that need to be modified to get the desired effect. But when i try to do bigger pieces they tend to either look like the drawings of a small kid with few colors(in the case of "organic" things) or like legos (in the case of squary-things like houses and sofas)

 

I've been looking around for guides on detail and texturing, but i can't seem to find any.

 

I know that no texture is universal, but there has to be a few rules/guidelines such as "When so-and-so is done in such-and-such way, the colors have to be brighter/darker compared to this-and-that" if you know what i mean. I suck at explaining.