You're going to be way too squishy early game. Shyvana needs lifesteal or something else to be able to sustain in a solo lane. This should be accomplished via wriggle's and the lifesteal mastery. Also, max out W before you put any spare points into Q. Take one point in E at level 4 and leave it there until you have to max it out, as it's only real use is to put the armor debuff.

i use a very similar build for shyvanna, good job, and please check out my builds! :)