Looks good pending you don't lose more hair. Reason I say this, smp done on density fills must be darker in shade to look decent. Only downside is if you start losing hair that darker shade will appear super unnatural and if you ever decide to shave and go full smp, you'll have a mess on your hands from the dark pigment used.
But it doesn't look like you'll be having any issues with hair fall at the moment so all should be well.
I tend to stay away from this. Risky business.