Hi,
the model is nice enough.
I have two suggestions:
1- check the alignment of wheels and track on the left side, the photo from the front seems to show some asymmetry;
2- the periscopes are too vivid as color, and show that the plastic isn't perfectly flat. I suggest to use a very thin piece of clean plastic from the envelope of any commercial product, paint it with some very dark grey-blue-green shade, cut to size rectangles and glue over the existing periscopes with a small amount of white glue, as a sort of decal. It gives good and easy results.