Is it preposterous to have 2 different light sources in a design project?

I am working on a branding skyline for a company, and I'm using a top-left light source for the geometric buildings, but then my ground landscape and trees are using a top-right light source.

My question is it this is acceptable in terms of design. I mean, my initial thoughts were to create a left-to-right sense of movement, but the opposing light source may be helped to create balance in the design. Does this idea make sense, or am I totally wrong? I know consistency plays a big role, but it's not looking that crazy.

Here's the image (not all buildings are right yet, only the far left one if correct).