Absolutely. This could only be done by somebody who knows the Harry Potter franchise well. There are a few persons I am not fully sure about if I recognized them well.... From down to up
Albus Dumbledoor, Harry Potter, Ron Weasley, Hermione Granger, James & Lily Potter, Sirius Black, Rhemus Lupin. I think the one in the flower bed is Severus Snape (as a teen), and I think the one holding Gryffindor's sword is Neville Longbottom, with Luna Lovegood, to the right of him. I am not sure about the old person left of him. Well furhter up of course Rubeus Hagrid, Dobby, Nymphadora Tonks, Minerva McGonagall. The woman beside her I am not sure about. Then Fred(left) end George Weasley. Percy (the one with glasses, I believe he also had glasses in the book), Ginny, Bill and Fleur Delacour. I think above Bill and Fleur are from left to right Charlie, Arthur and Molly. Then Regileus Black and Kreacher (both wearing Slytherin's locket), Draco Malfoy, Nagini. Above that Bellatrix Lestrange, and Narcissa and Lucius Mafoy, and alst but not least, Tom Riddle aka Lord Voldemort.
Not fun fact, the only Marauder not shown is Peter Pettigrew... I guess this artist also hated him for his betrayal (a lot of fans making art of the Marauders replace Pettrigrew with Snape, due to this hatred, since even though Snape and the Marauders hated each other, Snape's allegiance was with Dumbledore in the end and Snape showed himself a brave man where Pettigrew was a coward).