I just want to preface my answer by saying that you always *can* open commissions at any time, no matter your skill. The only thing that determines whether you get commissions or not is how well you're known and finding someone who will pay for an artwork from you. Try not to make "opening commissions" into that big of a deal, because it's a rough start. You may not have offers in the beginning no matter how good you are, depending on what kind of an audience you have. Or you could have people falling all over you to get one. Always hopefully the latter, but you know... Things don't always happen the way we'd like them to.
Now if you want an honest opinion based on your question, I personally think it would benefit you more to work on your skills more and gallery in general before opening commissions. One very important thing to think about when opening commissions is that you'll need examples of your work to show people the kind of thing they'd be paying for. The greater amount and variety of subject matter you can show, the better. Right now, your DA gallery mostly consists of drawings of just your fursona, with maybe two or three other characters thrown into the batch. None with backgrounds, and from a quick glance over, your drawings have only ever consisted of 2-3 colors. That's all well and good for working on personal stuff, or if a commissioner happens to have a blue and orange canine fursona, but from looking at your gallery, how would someone know how well you can draw horses? Felines? Wings? Backgrounds? Younger characters? Different body types? Multiple characters? Characters with a lot of colorful markings? Would you know how to tackle a commission for a watermelon-themed kangaroo-walrus?
Commissioners can sometimes come up with
really crazy ideas. And although you may know the answer to those questions, the only thing commissioners have to go on is your previous work. Build up your gallery so that commissioners will know what to expect when they ask you for something. A fantastic way to solve that problem is to take requests, lots of them (and actually finish them! because they do no good otherwise). By experimenting with other people's characters, you'll gain more skills drawing different species, as well as your artistic skills in general. If you feel you're lacking in some area, you can even ask people to only request drawings of certain species.
Long answer is long, but I hope I helped.