go camera gallery post, got a lot sifu there, as for toe food picture, try go to brighter place capture. i spot a lot of your picture is dull and not enough light.
and subject in the photo also need more interesting 

Frankly still need lotsa of improvement probably your setting (try using manual instead of auto & switch off flash. Hand must be very stable & steady. Using close-up/macro mode for near object & try to shoot far background to get the DSLR bokehness. 

Very subjective question..All depending on your liking..Some prefer this capdase style casing, some simple clear condom slot in, some fabric casing will do..

For me fabric casing is the best either wth naked set or invi shielded set. auto cleaner for your camera len.
 

capdase is ok.

there u go.this