I really like this - never bought the mini coz I don't like the unhelmeted marines but it totally works with that head swap!
Love the yellow too, nice work.
You have quite a story in your profile. ;) I think this miniature looks NICE!!! The colors are very rich and bright, and I like that. However, I also think the miniature could use some more overal highlighting. There are no parts that really stand out. But I know yellow is a hard color to master. Just keep up the GREAT work!!!