This was mentioned elsewhere but I thought it was cool enough to deserve it’s own post. The artist is Dusty Abell and they are selling copies on their website here: https://www.dustyabell.com/products/star-trek-doctor-who-friendship-is-universal-print
I only noticed now that McCoy is holding the Seventh Doctor’s umbrella. ‘Bones’ McCoy, that is — not Sylvester. Good in-joke.