My husband wants to work more than he wants to spend time with my son and I.?

I've been happily (for the most part) married to my husband for a couple of years now. He's an artist and works out of our home. Four months ago, we started our family when I had our son Theodore. He's a GREAT dad! The best really. He watches him while I work full time. He's very attentive and nurturing. Plus he get's up for most of the night time feedings. As far as a dad's concerned -I couldn't ask for more. However, it seem in the past couple of months we've become more like two ships ping in the night. It feels like punching in and out of a job. As soon as I get home from work he wants to hand the baby off and go work on his art. On my days off he spends all of his time in his studio downstairs working and I'm left to take care of the little one all day. Don't get me wrong -there's nothing I'd love more than to spend all of my time off with my son, but I want to spend it with my husband too. I feel like we're really drifting apart. He get's some work done durring the day while the baby naps and plays so it just seems like he'd have a little more time to spend with the baby and me as a family. I get home around 2pm and he's gone in his studio until 1-3am. I haven't gone to bed at the same time with my husband in months and I feel like I didnt get married so I could lay in bed alone every night. I don't even feel like I can talk to him anymore because he's always angry and snippy complaining about all the work he has to do and not enough time. I have a job were I punch in for 8 hours and then punch out and go home. I dont bring my work home with me, I dont work late or go in early or work on my days off so I just feel like maybe he needs a more scheduled life. He hasn't taken a day off and not drawn or painted in over a year and a half. He even brought his sketching pads to the hospital in the delivery room! I've tried to talk to him about it and he just gets mad saying he has a pion and a responsibility to his art. I do think he deserves to work on his art, but I feel he also has a responsibility to the family and needs to make sacrifices to be with us sevral times a week. When I suggested this to him he offered to give up Tuesday and Thursday evenings but not the day time if it happens to be my day off and he said he'l most likely wait for me to go to bed and then he'll get back up and go work. I don't feel like that's enough but I dont want to be selfish either. Should I just let it go? I should mention in all fairness, that he is an excellent house keeper and a good friend to me other than the work thing. I would say he's generally a great husband but the lack of time he wants to spend as a family is really getting on my last nerve!