Pretty good, actually. The curve of the bottom limb is perfect, to my eye.
The upper limb has more bend close to the handle, and less close to the lever. Try to get that curving out right to the transition from bending limb to stiff limb.
Once you do this, the top limb will be weaker. If it isn't too much, you might call that positive tiller, or slightly weaken the lower limb to balance them.