The cover is by the regular artist, Esad Ribic, one of Marvel's many talented painters. He manages photo realism while still having his own distinct style, a style that is produced by color selection and layout rather than visual stunts or quirks.
The interior art is a fill-in by Das Pastoras, an artist that exemplifies the difference between 21st Century Marvel and the 20th Century Marvel. The former embraces diversity rather than boxing the creators into a House Style like the latter. I will not say anything more about this issue because it would cause me sorrow to think that I diminished anybody's enjoyment of this gem by saying too much.