It is very good for a first attempt, both of the pictures seem blurry. But you seem to have a grasp on color theory, which is vital :P The 2nd one especially, you used subtle colors which please the eye.

Try to put more depth in to the flower though. Take into consideration of lighting, not everything in lighting has to do with lighter/darker shades of the same color. eg. Grass at night has blues in it, not only greens.