The incomplete feeling may be a result of clashing art styles. The tree is rendered much differently than the dinosaur, and they appear awry being the only two elements next to eachother.
You've got all this shading and roundness to the dinosaur, and then the tree is flat lineart. it isn't even complete is some areas of the tree.
The concept is a little weak so far, and designfrieks is right that this could be processed further.
On a technical note, the front right dinosaur leg looks attached to the neck instead of the shoulder, and the back right leg could be included underneath.
$5.