Welcome Valenteana!
First off, I hope you have fun here. That's what most of us are here doing (with a few occasional sales). One thing I notice from reading the forums all the time is that a lot of people become disheartened when they don't sell stuff immediately. So, to help you with the right expectations, let me just say that you are going to have:
1. A lot of fun in your first year!
2. Not as many sales as you would like (if any)
Don't worry, sales come in time. And they build. The more you sell, the more likely you are to sell again. The #1 thing is to have fun. If you have fun every time you upload an image, then you will be inclined to upload lots of images, which means more fun + more potential for sales.
Here's some tips...
1. You already have a real picture for your avatar, which is good! Many new people use a sketch or something. A head shot is great, but I'd recommend a smile! Also, I would suggest changing it once in a while to add variety (every 3-4 months or so, although I haven't done this myself because I'm lazy). Another good options for your avatar photo would be an action shot of you painting something.
2. Your bio is good and not too long (ours is too long but once again I'm lazy and haven't gotten around to shortening it). One suggestion for you would be to rewrite it to use complete sentences
3. For now until you get a chance to get a real photo-reproduction setup going (more on that later), I would only offer to sell small size prints and / or greeting cards. Your work looks very lovely, but you are going to need a way to take an archival-grade picture of it (or invest in a good scanner). What I mean by this is that the photography process will not introduce anything that isn't already there. Colors will be accurate, the crop will be perfect, and there will not be any lens distortion or other odd effects from the camera. This high quality image is what is required to sell big prints, which is where the money is!
There are others on this forum who are experts at this and I'll wait for them to chime in. However, if you go the photo route you will need (at a minimum)
1. A good DSLR camera with a prime lens (you can get something like this for 200-300 dollars used on ebay). You don't need cutting edge here...anything with 12 megapixels or up will suffice. For a good starter camera that's easy to learn on, I personally went with a Canon Rebel XTI, and have moved up to a Canon Rebel T2i.
2. A tripod. This is required to position the camera exactly level with your painting. By having the focal plane of your lens parallel with the plane of your painting, you will ensure maximum sharpness. Also, you want to set it up so that the camera is shooting directly at the center of your painting.
3. Good lighting. You need some soft lighting coming in from the sides to illuminate your painting (don't use direct light from the camera's position, it will reflect and cause glare). A 45-degree angle is ideal.
It will take time to get good at this kind of photography. It is an art in itself, and I'm not an expert in it at all (we do landscapes). I have a feeling some others will come on here soon to give you the advice you need. It might seem overwhelming, but I'm sure you'll do fine!
