The lines are very good, and you did a very nice job with proper lighting of such a helathy Aloe Vera plant. :) The only thing I could critique would be using a white paper background (or some photoshop manipulation) so that the pot and ground are fully whited out. :) Keep it up!
The angle works well. The plant looks a little peaky to me, a touch yellow which doesn't help. The symmetry is broken a bit by the two bent leaves top left which you could straighten out. The white background also means that you have to strengthen the subject, so the pale leaves are not helped. A good idea and well executed with the focus on the centre of the plant and limited DoF to give depth.
Nice and clear image, and a good compositional concept but the image looks plain and lacks colour. i think the WB is a little off too, the leaves look sorta blandly coloured