A few things:
-the fingers on the green one would look better with an outline or shading on them as they blend into each other
-the sun in the background is very eye catching and distracts from the main focus of the picture, normal clouds like the original or a smaller sun would be a better choice
-the phone is too flat of a rectangle when it should look more like a rectangular prism to give it some depth
Otherwise you captured the style of the original comic well, the scene is a lot clearer due to better use of lines and being less crowded, and I actually can tell that these are homestuck characters. Gg!