Nick, the first things that come to my mind, I do like the shots where you played with depth of field and light. The first with crescendo sized glasses is my favorite, the vignetting is cool (if a little heavy handed). The chess game is also interesting. And the color contrast of the bright green window over the brown background is pleasing. I don't see any other keepers here.
One thing, try to avoid (unless some specific circumstances) smacking your subject right in the middle of the frame, it makes for a rather bland composition. Try to losely follow rule of thirds (run imaginary horizontal and vertical lines cutting your image in thirds, and place subject at one intersection). It doesn't need to be followed in a strict manner, but it works pretty well for most things. I'd skip the garden dwarves altogether, unless they're in their environment and you find some crazy cool angle or composition. Your images all look a little on the dark side, you might want to start playing with exposure compensation, maybe try Center Weighted Average metering mode over Multi (CWA tends to give lighter images, so does the Portrait setting that automatically lifts shadows a bit).
One last thing, flowers are a tough subject, because they've been done a couple million times, so you usually have to get close, use rule of third and take advantage of shallow DOF to get something mildly interesting to look at.
Again, I do like the glasses, chess game, green window, I think you used a good eye for those three.
Don't be afraid to experiment a lot and get out of your comfort zone.
At this point until you get more comfortable with what you like to shoot and your compositions, I'm not sure I'd burden myself with RAW (but then again, I'm a JPEG lover seing RAW as a crutch).
Are you familiar with Kirk Tuck's blog "The Visual Science Lab" ? If not, give it a quick look. Kirk is a master portraitist and his writing is very inspirational as to why and how to find your style, what you like and how to improve on that. I think technicalities are the easy part, it's easy to improve if you do the homework. Getting inspiration and finding your way though, is another story. Try to replicate photos or at least get inspirations from shots that give you a warm feeling. Personally I'm a sucker for portraits and I know checking Kirk's work and challenging myself to use the square format for a while has been immensely beneficial for me. When I look at the progression of my shots over the past years (and months) I'm amazed at how far we go. We are always better when we photograph things that matter to us (again, I sorta doubt garden dwarves are the love of your life). Photography is about documenting and sharing, so don't be reluctant to shoot what you love (relatives, places, things) and share them with us. When you love your subject you get out of your way to rendering in a flattering way. Just play !!
