There is a difference between professional quality and commercial quantity. I've tried to stick up for you a little but this statement doesn't help you. Professional quality might not be as fancy, but all of it's aspects are usually perfect. Color choice is always exact and the image itself is smooth and clean. Your images seems just like filters from photoshop. Professionals can achieve their goals without using filters in photoshop. I do not use filters in photoshop. And if anyone knows about coloring, about lighting, it's me. I've programmed many image editors and written many guides on contrast, resolution, dithering, etc. You used some sort of filter/ rendering. If you used hand dithering, you'd be a really good pixel artist. Looking at the images, doesn't really show much about your knowledge much.