I'd have to say that this is amazing. I don't think I'll ever reach that stage of artistic ability. It looks like something straight form the TCG--the Pokémon's appearances and every detail are spot-on, the backgrounds lend themselves to the emotional impact, and they're not just posing for the camera.
In response to the people saying that Lucairo isn't staring down (or up, in this case) at Regigigas, remember that Regigigas has no actual face to stare to. Unlike the other Regi's, Regigigas doesnt even have a clearly defined are to look at if, say, you want to talk with him or something.
Lucairo seems to be a great deal more detailed and carefully-drawn than Regigigas though. Lucario reflects the perspective (three-point perspectives are always more difficult than other points of perspective) precisely, but no so for Regigigas. Regigigas doesn't quite look like he's seen from below, particularly at the top of him: The foliage at the top sticks out too much; it should barely be visible. The left and right glowing lights don't align either, which makes the black stripes at the top look unever. Lastly, the seven black dots are identically perfect circles, which shouldn't exist from such a skewed angle as this.
Then again, Lucario may be intentionally staring at Regigigas' groin, since that's where his punches will hurt the most.