While I agree with the playstyle advice, I have to disagree on the build. Your build is a more old style build, and it still works fine, but I think there are better options available. For one, Shyvana massively benefits from more CDR and yet your build only has 10% in it. Allow me to present an alternative.
I only play Jungle Shyvana and not top lane, and I have 2 main builds depending on whether I feel I need to be tankier or I can focus on damage. The first build is a more damage centric one with a 21/9 mastery setup.

. This build gives you an enormous amount of both dps and burst while also making you tanky enough to take some hits. You have 3 different slows, so sticking to people shouldn't be an issue, and BC+Hydra+Dragon Form allows you to shred an entire teams armor extremely quickly and also givng tons of sustain thanks to both hydra and botrk. You will dominate entire teams with this build if you get even a few seconds to attack .
The second build build is more of a front liner build that sacrifices damage for higher tankiness with a 9/21 mastery setup.
with possible substitutions of
,
,
, or
when appropriate. This build is much more about diving first into the enemy team and giving your team a strong initiation and tanky wall to use for their safety. You can either choose to attack enemy tanks to shred down their armor with BC and health with botrk, or you can chase down enemy carries and let your team deal with their front line.
In either case, the new Black Cleaver is absolutely core. Why? Because it gives tons of stats that Shyv loves. It gives AD, which Shyv scales well with. It gives health, which synergizes with her already high natural resistances. It gives MS, which someone like Shyvana can never have enough of. And it gives 20% CDR which is a huge boon for her since Shyv is a champion that loves CDR but perviously had no good options other than SV for for building it. I also run 15% CDR at lvl 18 in my runes, so with either build, I will reach 40% CDR. And let me tell you, A Shyv with 40% CDR is alot scarier than one with 10%. You can keep your W on indefinitely so long as you keep autoattacking and your Q is up every couple of autos or so.