I have two fears here. First is, as the others have said, you don't have enough numbers. If you're in the 20-30 range at that points level, your army had better be really tough (like, Vault Warden level). Black Numenoreans supported by a Shade are tough, but I don't think tough enough to make up for the lack of numbers.
My other worry is that your anvil is very short. If you want me to attack your Shieldwall so you can wrap your hammer around and flank me, I think you need a longer Shieldwall.
Here's a quick modification I just wrote up, see if it suits what you're trying to do or not:
Shadow Lord on Fell Beast
6 Morgul Knights
12 Black Numenoreans
12 Orcs with Spears
That comes out to 710 points, 90 points to play with if you want a banner or Spectres (or both), maybe an extra hero, or beef up the numbers a bit more. It's still only at 33 models. Personally, I wouldn't even bother with the banner, you already have a Shade, the banner is just overkill at this point.
Visualize yourself using the army and think about how you'd use it, from there see what models play into it. Just keep in mind that, at this points level, you're either facing massive armies or massive heroes (often both).