Hi there, DDD.

Welcome to RetouchPRO!
You've made a pretty good start there and your question.....
Quote:
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But from a distance it still looks like a photo.
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..is one that's gets newbies and oldies alike.
There are (usually big) differences between a photograph and a painting. When you take a photograph (especially as an amateur) you probably didn't arrange the lighting, didn't remove unnecessary items, didn't get up close enough. As a painter you would have decided these things, to your best advantage, before starting.
Follows then, some suggestions to get a photograph looking more like a painting...
- Crop to get the main subject up to size and in the right place;
- Remove unwanted items
(I thought the skid marks going up to the little girl were a bit worrying!);
- Fix the lighting on the subject
(I had to lighten the girls a lot to stand out from the background);
- Beware of too much background detail
(a "real" artist probably wouldn't paint every leaf - I used Filter>Stylize>Diffuse>Aniso.);
- Raise the saturation to get firm colours
(I went for +40%);
I tried to illustrate some of this in the attachment. Howver, your image is very small (and I cropped half of it out), so remember that around 800 x 600 is usually the best.
Most important tip of all....Have fun!!
Rô