I see you already got welcomed. But I'd like to wish you a warm welcome too!
Heyla!
I noticed you were wondering about traditional commissions. While i don't have any groups to recommend that would be good for that, I do have a bit of advice to impart.
Commissions are exceedingly hard to come by on DA unless you've built up a huge following. With your art, I don't think you'll have a lot of trouble building a following. Your art is fantastic. But just keep in mind it can take some time before commissions start coming. Some artists go many years without getting any, and a lot of people on DA who want to commission don't actually want to pay very much for the art.
Which is a shame because artists shouldn't have to sell their work for pennies in order to get commissions. Anyway, there are groups that are aimed at trying to get you commissions, but they hardly ever work. Most of them are full of artists who want the commissions, and not people who are willing to pay for the art.
That aside, don't ever give up. With your talent, I have no doubt that you can start picking up commissions soon. Just keep putting yourself out there and practicing. The more people see of your work and notice you the better.
I do recommend watermarks on your work though. The little signature in the corner of your work is nice, but art thieves are very prevalent on the internet. Watermarks can save you a lot of hassle. Your art is worth something. If someone wants to see it without the watermark, they should pay for a print.
Anyway, I hope you enjoy it here. And I wish you the best of luck. I am Saij by the way.