Personally I find it hard to use.
The menu at the bottom is very confusing confusing. It feals like it is just a random collection of words with no hints as to what they are.
The categorys need to be distinguised from the subcategorys. For example you have:
photography underwater landscape
three words in a row with just spaces in between them. I had a lot of difficulty figuring out what this means. You need some thing that makes the photography stand out as different than underwater and landscape. Yes you used slightly different colours of grey text but the colours are so close it is very hard to see the difference.
Then is the subcategorys. Is it "underwater landscape" or are there two subcategorys "unerwater" and "landscape" Again you need something besides a single space to break it up or you just read it all as one thing.
Something like this is much easier to read
Photography
.......Underwater (the ....'s are supposed to be a tab or indentation but wetpixel was ignoring my spaces so I had to put dots)
.......Landscape
Or maby buttons with clear edges. But you need somthing to tell the reader when to stop or else it gets read as "photography underwater landscape" and you have no clue how to interpret that.
The thumbnails are way too small. I can not tell at all what the pictures are of before you click on them. They are so small that it took me a while to realize they were changing when I clicked on different categorys.
And it takes too long for each picture to load. The animations are neet but slow things down too much for my patience.