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:The only downside: Large pictures also take longer to load, even in the normal blog-view, so I usually go for max. 2000px width.
Unfortunately mis-use and copyright infringement is quite normal nowadays. Everybody seems to think that we are doing this anyways & for fun only...

Well I hardly sell anything so for me it really is a hobby but still I tend to be cautious
I will start uploading larger versions I think and will drop my logo off the photos as well and good for a merger size I may try your 2000pix idea