I'm pretty sure Seel wouldn't give you a cham for art (because chams are very hard to get even though there are so many adopts and takes a lot of time to design them and add to a masterlist)
I'm pretty sure the only way to really get a cham is when the custom chams or adopts come out (Which are usually sold for real money not art)
Or you could wait for an MYO event which I don't think will appear anytime soon....
Or really you can try go to Cham ufs or selling thingys in the chimereon group but it's unlikely they will sell for art once again because Chams are hard to obtain ^^'
I hope this helped? But maybe it's better you get advice from Seel since he's the one with all the deets
But there is one other way too tho! The monthly raffle for first time owners but your account must be at least 5 months old which I don't think you have reached yet... But good luck trying to get yourself a cham! And I hope I haven't interrupted you ^^'