Hi there,
This is quite a nicely done basic paint job, I have a couple of thoughts off the bat:
1) Drill your gun barrels; it seems like a little thing, but I've found it makes a really big difference in the look of the model.
2) Your base looks a little "flat", I think it could do with some highlights and a wash to make it a bit more textured, particularly the plant; you've done a nice job on the robes, so you're obviously up to it.
Hope that was helpful,