Stubs this short are only a concern with high speed interfaces, not SPI.
The angled bits could stand to go, they just look ugly (some will call the acute angles acid traps, but that apparently isn't a problem anymore; so I stick with an aesthetic reason instead).
Add stitching vias around the bus.
If you want, add source termination resistors, at each driving pin (so, at master SCK, MOSI and CS's, and at slave MISO's). 47 ohms would be typical, or higher if you don't need super fast operation.
Tim