Hi and great you're joining in! One thing I notice is that you've got anti-aliasing (the blurring edges) going on the orange and light gray, but not on the dark grey. That throws the eye a bit. To add shading and highlights? Pop? Hmm ... that really depends on the effect you're going for. A simple and effective one is to boost the contrast. But I'm possibly not the best person to ask about photoshop, since I'm more of a vector lover ...