The composition of your finished painting needs some careful consideration.
Some simple guidelines that help are...
No one point of interest?
No one point of interest -- that is fine though you need to consider how the viewers eye will be led around the painting.
This can be done with:
In Wikipedia we learn... Some principles of organization affecting the make-up of a picture are:
Shape and proportion
Balance among the elements
Harmony, or consistency among the elements
The orientation of elements
The area within the field of view used for the picture ("cropping")
The path or direction followed by the viewer's eye when they observe the image
Contrast: the value, or degree of lightness and darkness, used within the picture
Geometry: for example, use of the golden mean
Illumination or lighting
Repetition (Sometimes building into pattern; rhythm also comes into play, as does geometry)
Breaking the rules can create tension or unease
As you become more experienced and confident in experimenting you will find that 'breaking the rules' creating tension or unease is just whats required to give your painting a wow factor.