I know, I know, everyone says how it is the most difficult medium but truthfully, the myth sayers are the ones who can't paint watercolour because they don't try.
The main issue most beginners in watercolour painting have is determining what the problem actually is!!
Sometimes there actually isn't a problem but we've got to that dreadful middle stage and don't know what to do next. If you definitely have an issue to solve, read on McDuff!!
If you decide the composition or design is a problem, redraw the corrected composition on spare paper and re-work the improved version into the painting. Yes - that's right paint over it, you might need more paint!
Could you draw/paint it better? Practice drawing the shape you require on spare paper, then practice painting the shape/colours etc on some spare watercolour paper. Wet the offending area, sponge out problem shape/area carefully and re-draw and paint.
A shape is not quite right - I've solved this problem in my paintings in 6 or 7 different ways. Here's a couple you can try (1) wedge a dark tone next to the problem area correcting the shape, (2) stencil lift to correct the shape or (3) soften an offending edge with a damp sponge.
What watercolour problems cannot be fixed? The most difficult actual watercolour problem I have found is too much opaque pigment mixed too much on the palette and then stirred up too much on the paper - too dead!
Sometimes a stencil-lifted highlight will work or you could try adding more detail to another part of the painting to draw attention away from the offending area or carefully glaze a transparent complementary colour over the problem area to knock it back.
One of my very good painting buddies always says "Big planning equals little painting problems ergo little planning equals big painting problems!" how true this is!!
Always try to push yourself to finish every painting whether you've decided it will be a 'good' painting or not. The truth is, you might not be able to fix a work you've deemed irretrievable but the effort of trying will teach you more about watercolour/painting/process than starting yet another painting that you'll struggle to complete. Further, if you've already deemed the painting a failure, you really can't make it any worse - keep at it!!
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