That's kind of what it's like to look at a piece of art that is lacking contrast. We get bored with it quickly and move on, looking for something more interesting. Contrast is essential to good art, be it light & dark, smooth & rough, large & small, or any other variations of the theme. It draws us in, causes us to linger, and helps to define what we are looking at.
Contrast gives definition and depth to various shapes or objects. Contrast in color creates excitement and vibrancy. Contrast in texture helps us relate to what we are looking at and enriches our experience. Well placed contrast creates movement and helps us identify the focal point in an artwork.
So, as you draw, paint, design or create, think about how you are using contrast. Look at your work and ask yourself, "Is there enough depth, have I added highlights in the right places, is there movement and have I used contrast to create interest?" If you have an unsettled feeling when you look at the work there may be something out of balance.
Is there ever too much contrast? It is possible, depending on your subject matter and the emotion you are trying to evoke, that too much or too little contrast can be a problem. Sometimes contrast can be subtle and still be very effective for the particular work you are doing.
I hope you find this helpful. Feel free to share your own thoughts on contrast in a comment below.