2,000 will get you a nicely equipped iMac, either 21" or 27" but you'll not be able to take that computer to class.
The 15" MBP is out of reach as the staring price is 2,200 and I would assume for a graphic student you would want a dGPU and a larger screen
The 13" MBP is probably your best bet given the pricing.
The question boils down do you have mobility needs? If you need to take your computer to class then the MBP is the obvious choice.