First, you will need to add a link to the original artist (and/or the person who now owns the work?) in the description of this image. :)

As for how to commission... you will need to read people's TOS to learn how to commission them. Commission information is often found in people's profiles and journals, if they are offering them. You will see people advertising their commission slots all over FA, and those who do commissions will often post if they are open for work or not on the main profile of their DA account. :)

Thank you! That sorted some things out ~