This is a very far way to come for an artist like you, I believe, and I think that a person like you should deserve more attention for all the effort you have amassed into this comic, with your art improving every step of the way taken.
I am going to proceed to critiquing this specific strip:
You have done a fairly good job with the shading on a few panels, and it is a very nice additional small detail added to "polish up" this comic. I thought that you could perhaps change the way that Foresight was positions or the way his expression changes.
Now for overall critique on wholesale comic:
The story telling is so profound and can impact the reader in such a way that, possibly, even a person unfamiliar with Dr. Who can follow and understand everything, and develop a subconscious relationship with the characters in this story: a sign of a special literate talent.
Despite the huge improvement that your artwork underwent this whole time, i think you still need a few extra step before i can call you a fully mastered artist.
Few people can go such ways to do what you have accomplished today, and you have to be proud of what you did. Disregard any undermining comment made to you on your efforts, remember that you have a storytelling knack that few can muster well enough to create an elaborate and memorable story.