It actually looks like a Galaxy image that was manipulated in an imageing program using "resize image" that it was scrunched smaller and got pudgy!
But it's a perfect design for a refit, however. In a refit, you can't expect that the entire style of the ship is going to change. The main body will retain the older style, whilst the refitted parts will reflect the most recent trends. The result is indeed something of a mismatch, but that's to expected from a refit vessel.
A bit like the Enterprise and the enterprise refit And The Refit While I don't like this particully this upgraded Galaxy class, I can see what you mean.