If you want to round out more especially in the face gain the weight. I'm also 5'10 (3 years of hrt)
The face changes at least for me was very gradual. I didn't see much of a change till about after the first year and more subtle changes in the 2nd year.
I've said this countless times before but if you're really thin to begin with, gaining fat will just help your development even better. I started out at like 115-120lbs when I first began hrt. I'am now around 140-145 and I have some pretty awesome curves and my face feminized a bunch, which is mostly due to the weight I gained and genetics. My mom and sister are both bottom heavy so I also have a similar physique, I'm just taller than them. To be fair my metabolism is still high and it was a lot of effort to gain that weight in the course of two years. Also I have tons of stretch marks on my thighs, calf, butt/hip area but I don't hate them, in fact its a bit affirming. It just comes with the territory sort of speak. I love my body right now minus my genitals. I'm hoping to gain some more weight but I'm pretty happy where I'm at.