I like the new Revell VII c model a lot, as it is exact copy of the 1/72 scale one. They went a long way to preserve all the detail present on the bigger brother.
Your model looks ok. Nice colors, and weathering.
However heres few areas that could have been improved.
First thing- the cleaening of injection points.
The rigging. I know the thread the Revell uses is a bit fuzzy, therefore is better to replace it with something like fishing line, or lycra line. Glenn Cauley uses Gutermans thread. I just ordered the egyptian cotton thread- looks superb.
Sometimes adding extra detail can be very rewarding. Im not talking about the PE, and stuff. Studying the pictures we can add a little bit extra to make our model stand out.
Look at the picture of exactly the same model as yours:
I added some rails from steel wire, and reworked the periscope housing using the coton bud tubing.
Footpegs from aluminium kitchen foil.
Unfortunately i never finished it.
We can experiment with presentation of our models to.
Here is the picture of 1/125 old revell boat finished as sunken boat, and dipped in my fish tank for over a year:
Hope you not going to get discouraged by my post, and i wish you luck with your new project. Im sure the VIIc/41 is going to look fantastic!