I could give more specific advice if you could post some representative images. I have used a C750 exclusively for the past ten months. I like the 10x zoom but all of the images I have had accepted (and those I would consider submitting) are no more than half the zoom. The more you fill the frame the better. I originally used the auto setting but now use shutter priority. I also usually have to decrease the brightness in Photoshop. That really brings out the colors on Northwest airliners that come into Minneapolis. Even though a lot of my photos I don't consider Anet compatible, I am pleased to keep them in my collection. The make good prints. I plan to eventually go to a DSLR but I will keep a C750 in my flight bag. I have made over 7000 images with in since I bought it last June without a problem.
Cottage Grove, MN
Seeking an honest week's pay for an honest day's work