If it is a 501st Clone, there are two "racing stripes" that go down the sides of the legs, kind of like Han's bloodstripes on his trousers, not downward diagonal stripes across the thighs like you have.


See the racing stripes? Also, there are no downward diagonal stripe across the thighs.
If it is the blue ARC Trooper that you are going for, all the photo references that I have found ( I don't have any right now to post ) don't have blue stripes crossing diagonally down the thigh armor. Their legs are void of any kind of paint schemes.
If your clone is based off of something that I haven't been able to find, I would like to see the reference pics.
- Bill