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Thanks for your advice - how can I verify myself? Even if I upload the original picture without my signature, how would you know that it is my work which it is indeed?
I'm new to steemit and I haven't figured everything out yet...

Please see this guide - https://steemit.com/steemcleaners/@steemcleaners/identity-and-content-verification-guide-when-to-ask-and-when-not-to

Also, I'd recommend that you make a collection of your photos and post it together. Those seem to do a lot better on Steemit whereas single photographs are often overlooked.