I think this is the best portrait I've seen you post on here. It does look a tad dark, but your lighting is nice and you captured a very cute expression. Play around with lightening it, saturation and maybe even contrast a bit and see what happens. Overall, though, good job!
I hope you don't mind my comments...
For me the wood panelling in the background is a bit of a distraction. A larger aperture to blur the background and a square crop to tighten up the composition might've worked better for this particular shot.
I completely agree with The_Traveler. The baby is very cute, but the background really detracts from the image. It also looks very cool to me, but I am not at my regular computer so it may be just this monitor.