Some lovely compositions and with a bit of tweaking and practice you could have some really nice images, but I echo the above comment about giving your subjects space within the frame. Adding context to a picture can lend it more meaning. Just be careful with clipping your highlights - it's better to slightly underexpose than overexpose, as losing details in the shadow is less noticeable than in the white parts of an image. Also be careful to keep shutter speed up on moving images (i.e. the dog) to keep the image sharp, striking a balance with the aperture so that you can allow enough light into that camera and not compromise on the depth of field. Also don't over employ the sharpening or clarifying post processing as this will be more evident once printed. All I can say is keep photographing everything and anything you can, take every opportunity to learn (look up B&H photography on Youtube for lots of tutorials and lectures), practice in all weathers and light and be prepared to really put in the groundwork with social sites (Twitter, Facebook, Instagram, Ephotozine, 500px) to get your name out there. We have been trying to get an equine photography company off of the ground solidly for the last year or so and it's hardwork and slow going. It would appear that the best thing to earn a few pennies from is weddings, but you need a good portfolio to get work and work to get a portfolio... not to mention you need double all of the kit you need for other types of photography, so an investment of upwards of £5k. Good luck, definitely give it a good go and keep shooting (so to speak!).