My conversions

[saphire krakens]

here is a average assault marine conversion

[IBBoard]

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[saphire krakens]

There
and there will be another one coming up soon
2 marines beating down some orks on a dead ork pile

[IBBoard]

It looks like a good, dynamic in-flight post. The flight stand keeps him away from the base enough so that he doesn't get lost in the detail while not losing his connection with the "scenery".

The photos are a little blurry (it is always difficult to get good single model shots with some cameras) but it looks like you have Space Marine parts on the base. They can work well at times, but you might need to file them down a bit to get the most realistic position for them.