Yeah, you can read up about interpreting load lines. The lowest distortion for a triode will be a load line of infinite impedance (C4S), while acceptable performance generally starts at around 3x plate impedance. You can also look at the load line you've drawn and examine each chunk of the load line that has been sliced up by the curves on the graph. If the segments are pretty equal in length, especially close to your quiescent operating point, then you'll probably be OK. If the segments get really short on one end and really long on the other, you will hear that.