A few things Yorick needs

175 attack range like most melee's Its kind of necessary these days with minion block making it more difficult to cs

Using Q to target what mist walkers/Maiden should focus this will help a lot. currently missing E makes you look like a fool because you can't really use anything else to steer your minions.

In 1v1 its not much of a deal but in team fights its nice to be able to have slightly more control over maiden and your minions this way

Maiden shouldn't just die because Yorick does :( The infamous double split push isn't all that difficult to deal with since all you got to do is go after Yorick, and without maiden to back him up he loses significant dueling power & objective control.

It would also be nice if maiden didn't just suicide aggro into towers so easily, we can't control her but it would be nice if she had some sense of self preservation.

It would also be nice if Maiden could attack inhibitors rather then space out and go bonkers after killing an inhib turret.

Maiden/mist walkers could also benefit from some resistances scaling with yoricks like 15% of his because they die really easy to random area of effect.

Thats about my wishlist for Yorick.