There should be a very slight lean to the wall but only very slightly. And BW's butt does not and should not touch the wall (due to the ability to display her with out the column).
However, with the two pics you two posted there is definitely too much lean of the column and a little too much space between the BW figure and the base.
I honestly feel that out of all the statues done thus far and concepts shown....Black Widow and Medusa are the most concerning. BW with her lean since this was pre metal rod insertion in the leg situation, and Medusa because of all that damn hair. As intricate as the hair looks....I'm curious as to how that is going to be done and packaged. Is the hair going to be done in sections (connected at the hair root?) Is it all going to be one sculpt?
I don't have one iota of concern with Black Bolt or Ms. Marvel or Phoenix. But these two....ooooooooohhhhh...I shudder to think.
Good to know XM is far from perfect...shows they have lots of room to improve in the future.