I know that in the $\phi^4$ theory the tree-level diagram for two in-going and two out-going particles is simply a 'cross' where all the external legs meet at one point.
I'm now interested in a slightly more complicated case where I have 4 rather than 2 outgoing particles and I want not only the tree level diagram but also the one loop diagram. I think I know what the tree-level diagram looks like, but I have some trouble drawing the one loop one. I know that each vertex needs to have 4 lines connected to it. I managed to come up with something but it was just trial and error and I'd like someone to verify whether what I've done is right.
My attempt is: