It's come out pretty well, nice that you've been able to use a mosaic to remove the reflections
When I've been doing mosaics I've personally found that either APP does a better job of merging them together or if you want a free way of doing it, downloading Microsoft ICE. It does mean that you have to process all of the panels so that they're looking very close in colour calibration, black point and stretching but it tends to leave less artefacts than GradientMergeMosaic.