Look around you and think how you could express visually the things you see around you. How could that chair be drawn? What about this freezer? The corners arend as sharp as you could have thought in the first place and the carpet under it isn't as red in all the parts of it. Watch the details, do quick scetches or at least figure out how could you express those things.
No book can teach you how to create art. They can teach you styles and techniques but the heart and soul of making art is your own experience. So do it yourself, enjoy the whole process and not just the result.
Practice makes perfect and you even if your works don't seem good in your eyes, I promise that if you keep working with pictures, the ones you do after a month will look better. You can't learn painting, drawing, sculpturing or anything like that without doing it yourself. After a bit of practicing you will find the way of creating that suits you the best and when you keep practicing it, the results will be good! Just don't stop trying if something feels difficult. Usually the thigs you don't like are the things you can't do and therefore you should practice doing them and after that you will get better at it and it might turn even fun! And remember that it doesn't matter if the pictures (or statues or what ever you're doing) don't look good at first. Every piece you do makes you better in what you do.
Keep your heart like an open highway and let nothing stop you!
Do what it feels like and when you want to work with a picture, do it. Some days you might not feel like doing anything creative but I'm sure those days will pass and sometimes even making yourself to do something gets your inspiration back. However, sometimes it doesn't work and when it doesn't, it's pointless to make yourself to do something. Don't let that let you down!
Be open to new ideas and try new things. I think that the best way of finding the good working ways for yourself is to try many enough and then do what feels the best.
Don't give up. Try again! You have all the time you need when it's up to practicing. Just use it wisely.