Bill indeed looks big - but plumage is very wrong for juvenile of both of those.Young Crimson - Winged or Trumpeter
Canaries in Malta?I think the bird is in a very bad condition, for example having lost a lot of feathers at thebase of the bill and close to the eye, so the impression of a large bill may be deceiving;
if so I would think of something like canary or linnet?
Hopefully he updates the photo when he gets home.the ground color looks too reddish brown. but the photo is too reddish brown anyway (see green plant parts)
- so yes -it could be indeed well be a serin:
however - I can´fully exclude an exotic or a domestic canary... (and a serin wouldn´t be any larger than goldfinches...)
Thanks for the IDs , serin looks a good call.yes for the HB, for the finch I think a young serin , which has lost a lot of feathers in he front of the head