06-04-2020, 06:21 PM
Your image does not really show anything. If that is what you are using, throw it away and start again. Make an out-line drawing on a transparent layer.
For colouring in line drawings the most recent Gimp 2.10.14 & later comes with a bucket fill - line art option If not in your version of Gimp it is worth updating. Otherwise it is individual selections and fills.
Do not try and fill in a single layer, you can do that but it makes correcting errors that bit harder. The bucket fill - line art is quite good at finding boundaries but not perfect. You might need the occasional correction.
Up to you to find suitable patterns for the bucket fill, If some are semi-transparent, another layer for a general fill is used.
For colouring in line drawings the most recent Gimp 2.10.14 & later comes with a bucket fill - line art option If not in your version of Gimp it is worth updating. Otherwise it is individual selections and fills.
Do not try and fill in a single layer, you can do that but it makes correcting errors that bit harder. The bucket fill - line art is quite good at finding boundaries but not perfect. You might need the occasional correction.
Up to you to find suitable patterns for the bucket fill, If some are semi-transparent, another layer for a general fill is used.