If your main reason for posting images is to share them, then don't stick an intrusive watermark on it. A tasteful watermark can help with branding if you feel the need.
And be aware that copyright and watermarks are two completely different things.
^^^This.
You have copyright even if you don't visibly declare it on the visible image, or indeed reference it in the IPTC/metadata. That said many sites strip metadata and it can often be hard for people to find you as the copyright holder without a visible reference such as a watermark.
A watermark really only has two uses:
1) Directing people who are viewing your image to a means of contacting you. At the moment you are OK in so far as you have a distinctive name and a quick Google search finds you, and you alone. My policy is to take that to the next step and I have a full web address - others might put a mobile phone number as well - more likely if their work is news related and fast direct contact might be required. If I were you, and this was your intention then I'd use a less scripted, more basic font and consider either dropping a semi-opaque background to it to isolate it from the image more or changing the colour depending on the image. This also makes any attempt to avoid payment by citing orphan works a complete non-starter.
2) Deterring, but realistically not preventing people from copying/stealing your image. As has been mentioned above almost every watermark can be removed (and in many cases without destroying the image - at least when viewed on the web). Having a clear copyright/ownership statement will at least make them think, and make it a deliberate act rather than an ignorant one.
I'm with the sentiment here. If you don't expect payment, and don't mind if they are used without your permission then don't watermark them at all if you feel it detracts from the image.
If you do want to protect your work, then my advice is make the watermark significant enough to do the job you intend of it. Should anyone be really keen to see a cleaner version to make a final decision about whether to pay for it or not then they can contact you for a low-res sample. At the moment your watermark isn't significant enough as IMHO it doesn't cover enough of the image and is simple to remove.